[boost] [announce] Overload V2

I have upload in Vault an updated version of the multi-signature function wrapper aka "overload" File is called overload_20_3_2008.zip I think this will be the last one because it's feature complete and "nice" enough. New in this version is: - Support for pointer-to-member functions - Added is_set() and reset() to check for and clear a specific signature - Updated documentation (see test.cpp) - Code cleaned up and IMHO at the same quality level of my previous object factory example. Code is very small and completely self contained (apart for auto_ptr that is used internally instead of plain pointers). I think this could be an interesting example of use of C++ templates at beginner/intermediate level. Thanks Marco