Improve documentation of subgraph_isomorphism() and motifs()
Force inlining of simple UndirectedAdaptor functions
Force inlining of range iterator selectors
Use std::shared_ptr instead of boost::shared_ptr in property maps
Fix some trivial compilation warnings
Implement pickling of PropertyMap objects
Fix graph IO to properly address unicode strings
Switch to variadic template implementation of mpl_nested_loop() and run_action()
Force simultaneous filtering of vertex and edges

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%.