* src/graph-tool: added better error handling (output to stderr, cleaner information, return error status)  

        * src/graph/graph_bind.cc: added license info

        * src/graph-tool: added python metadata


git-svn-id: https://svn.forked.de/graph-tool/trunk@117 d4600afd-f417-0410-95de-beed9576f240