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This enables support for older versions of GCC (>=4.2), by falling back
to the boost tr1 implementation when the GCC version is less than 4.4.

Now the meaning of the bin edges given to the several histogram
functions are the same as in numpy/scipy. This means that the last bin
edge represents an upper bound on the last bin.

It is not necessary to gather the data range if the bin size is
constant. This also changes the histogram code, to better handle the
constant-size bin situation.

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.

This also simplifies the calculation of the coefficient.

This changes the meaning of the all_selectors type, which includes all
property types, and creates a scalar_selectors type, which includes only
the scalar types.

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)

Add global variables to configure.ac, to avoid unnecessary multiple
definitions.

Add $(srcdir) to include paths in AM_CPPFLAGS so that we can
compile the program writing all targets into a directory separate
from the sources.
This is done simply by creatig a subdirectory of the project root
and running "../configure" and "make" inside it.

This is a re-implementation based on new histogram code, which does not
build a 2D histogram, and is thus more exact and uses less memory.

This commit removes the internal property maps from the GraphInterface
class, and makes all property maps external by default. The internal
property maps were moved to the python layer.

Avoiding use of lambda::bind when not necessary (or very convenient).

The whole histogram code has been redone, and the code has been
simplified. The three-point vertex-edge-vertex correlation has been
scrapped, since it's not frequently used, and would make compilation
even more expensive.

This also adds some missing files to the generation routine.

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