* changed python filtering semantics: edges are filtered before vertices, not simultaneously. Original (unfiltered) vertices degrees are available to the vertex filter prefixed with "orig_".
* added missing boost licence file to src/boost-workaround/LICENSE_1_0.txt
* updated FSF address in src/graph-tool


git-svn-id: https://svn.forked.de/graph-tool/trunk@33 d4600afd-f417-0410-95de-beed9576f240