This reduces memory use during compilation.

Dumping boost::adjacency_list<> improves memory usage by a factor of
two, and also slightly improves performance in some cases.

The condensation_graph() function now returns a property map which
contains the community values themselves for each vertex.

Edges were not properly indexed after graph generation.

This is a large commit which replaces lambda::bind with boost::bind in
most parts of the code. This improves compilation time, and slightly
decreases compilation memory usage in some cases.

No longer only thrown GraphError upon any error, but instead throw
specific exceptions which are more meaninful and are mapped to standard
python exceptions, such as IOError, ValueError and RuntimeError.

Thins changes the graph filtering code slightly to wrap graph types with
GraphWrap, which automatically updates the edge index list when edges
are removed and added to the graph.

This also changes how graphs are passed to algorithms, which is now by
reference instead of pointer. (hence this touches lots of code, but
changes are trivial)

This includes a new vector property map type (fast_vector_property_map)
which has optional disabling of bounds checking, through its associate
map type (unchecked_fast_vector_property_map). This should improve
performance on algorithms which depend on tight loops which access
property maps.

Bounds checking is only disabled locally just before the algorithms run,
and proper care is taken for bounds checking _beforehand_. The property
maps exposed to python still have internal bounds checking.

This commit splits libraph_tool into different libraries:
 
   - libgraph_tool_core
   - libgraph_tool_clustering (*)
   - libgraph_tool_community (*)
   - libgraph_tool_correlations (*)
   - libgraph_tool_distance (*)
   - libgraph_tool_generation (*)
   - libgraph_tool_layout (*)
   - libgraph_tool_misc (*)
   - libgraph_tool_stats (*)

It also adds the python sub-module 'test', which provides extensive unit
testing of the core functionality. The core library is fully functional
and all test pass successfully.

(*) -> module needs to be ported to new refactoring, and does not yet build

This is a huge commit which completely refactors the metaprogramming
engine which generates and selects (at run time) the graph view type and
the desired algorithm implementation (template instantiation) that runs
on it.

Things are laid out now as following. There exists a main underlying
graph type (GraphInterface::multigraph_t) and several other template
classes that mask it some way or another, in a hierarchic fashion:

     multigraph_t -> filtered_graph (edges only, vertices only, both)
         |                               |           |           |
         |                               |           |           |
         |-------(reversed_graph)--------|-----------|-----------|
         |                               |           |           |
         \------(UndirectedAdaptor)------------------------------/

The filtered_graph filters out edges and/or vertices from the graph
based on some scalar boolean property. The reversed_graph reversed the
direction of the edges and, finally, the UndirectedAdaptor treats the
original directed graphs as undirected, transversing the in- and
out-edges of each vertex indifferently. Thus, the total number of graph
view types is 12. (The option --disable-graph-filtering can be passed to
the configure script, which will disable graph filtering altogether and
bring the total number down to 3, to reduce compile time and memory
usage)

In general, some specific algorithm, implemented as a template function
object, needs to be instantiated for each of those types. Furthermore,
the algorithm may also depend on other types, such as specific
property_maps. Thus, the following scheme is used:

    struct my_algorithm // algorithm to be implemented
    {
        template <class Graph, class PropertyMap>
        void operator()(Graph *g, PropertyMap p, double& result) const
        {
            // ...
        }
    };

    // in order for the above code to be instantiated at compile time
    // and selected at run time, the run_action template function object
    // is used from a member function of the GraphInterface class:

    double GraphInterface::MyAlgorithm(string prop_name)
    {
        double result;
        boost::any vprop = prop(property, _vertex_index, _properties);
        run_action<>()(*this, bind<void>(my_algorithm(), _1, _2,
                                         var(result)),
                       vertex_scalar_properties())(vprop);
        return result;
    }

The whole code was changed to reflect this scheme, but now things are
more centralized and less ad-hoc code needed to be
written. Unfortunately, due to GCC's high memory usage during template
instantiations, some of the code (namely all the degree correlation
things) had to be split in multiple compilation units... Maybe this will
change in the future if GCC gets optimized.

This commit also touches other parts of code. More specifically, the way
filtering gets done is very different. Now we only filter on boolean
properties, and with the above scheme, the desired implementation runs
with the correct chosen type, and no implicit type conversions should
ever happen, which would have a bad impact on performance.

Line breaks at column 80 were added, and all trailing whitespace was deleted. Code
comments were modified and some more were added.

	* src/boost-workaround/boost/graph/kamada_kawai_spring_layout.hpp: annotated code with openmp constructs.

	* src/graph/graph_adaptor.hh: graph_type should be a typedef to the original graph.

	* src/graph/graph_properties.hh, src/graph/graph_properties.cc: added pos_t type.

	* src/boost-workaround/boost/graph/fruchterman_reingold.hpp: annotated code with openmp constructs.

	* src/graph/graph_layout.cc: new file with graph layout routines.

	* src/graph/graph.cc: removed graph layout routines.

	* src/graph/graph_community_network.cc (struct get_community_network): fixed inversion of directedness test.

	* src/graph/graph.cc (GraphInterface::LabelComponents): use vector_property_map instead of HashedDescriptor. Don't use a static map!

	* src/graph/graph_adaptor.hh: fixed edge descriptor equality comparison, which must rely on underlying edge, regardless of whether it's inverted or not.


git-svn-id: https://svn.forked.de/graph-tool/trunk@121 d4600afd-f417-0410-95de-beed9576f240

git-svn-id: https://svn.forked.de/graph-tool/trunk@101 d4600afd-f417-0410-95de-beed9576f240

git-svn-id: https://svn.forked.de/graph-tool/trunk@78 d4600afd-f417-0410-95de-beed9576f240

git-svn-id: https://svn.forked.de/graph-tool/trunk@59 d4600afd-f417-0410-95de-beed9576f240

git-svn-id: https://svn.forked.de/graph-tool/trunk@58 d4600afd-f417-0410-95de-beed9576f240

* Added line graph generation
* src/graph-tool: some code de-uglification
* src/graph-tool: terminal output format changes


git-svn-id: https://svn.forked.de/graph-tool/trunk@56 d4600afd-f417-0410-95de-beed9576f240