This also cleans up some m4 boost macros, and includes other small
corrections to configure.ac.

This allows compilation with older versions of boost (>=1.38), which in
some sistems are the only option. This commit also removes the linking
of the boost_graph shared library, since none of its symbols are
actually required.

It is necessary to use -frounding-math to avoid run-time errors with
certain versions of CGAL.

This also includes the library CGAL as a dependency.

Fix compilation warnings with boost 1.40, remove unnecessary files, fix
autoconf macros and link with "boost_graph".

This also raises the minimum boost version to 1.40.

This implements a layout module (called 'draw' from python) with an
implementation of the arf spring-block layout.

This includes the edmonds karp, push relabel and kolmogorov maximum flow
algorithms from the BGL.

This prints useful library information.

This fixes bug where boost overlay files were not being used, when not
compiling from source dir.

Make sure libtool is properly modified, by doing it last in
configure.ac.

This adds the centrality module, which supports betweenness, eigentrust,
pagerank and absolute trust.

Now all symbols are exported by default, except those strictly marked
as hidden.

This includes the community sub-module.

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

This also creates the misc sub-module. This may be re-organized in the
future.

This contains at the moment functions to perform basic vertex and edge
searches.