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This also implements direct manipulation of OpenMP settings (schedule
and number of threads) via python.

Now, if either vertex or edge filtering is enabled, simultaneous
filtering is activated. By not considering vertex or edge filtering in
completely independent fashion, the compile time memory requirements
reduced to about 50%.

This fixes some strange bugs where deterministic position updates lead
to strange artifacts.

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

This enables the inclusion of the non-boost tr1 headers if a recent
enough version of libstdc++ is detected. This als fixes a bug with
clang when sparsehash pulls unwanted tr1 headers.

The object may be globally reset via the seed_rng() function.

This fixes some layout glitches with smaller graphs, and also
improves the convergence speed.

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.

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