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Now, whenever GraphWrap is being used, the property maps are always
in "checked" mode.

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.

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