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This is a significant refactoring of the statistical inference code,
with many cleanups and improvements, and is aimed towards future
extensibility.

The old community module is available as 'community_old' and will be
completely removed in the near future.

Now the degree sequence is verified with Erdös-Gallai inequalities, and
the edges are connected in a deterministic fashion. The edges then are
rewired with the random_rewire() function.

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.

The file graph_predecessor.hh was missing.

This returns the union of two graphs, and optionally specified property
maps.

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.

It is now much simpler, and works better.