STLplus C++ library collection SVN stlplus3

Localised version of the old os_fixes

Added safe iterators to the containers library

Rearranged documentation for the new library collection structure - and
rewritten a lot of it too!

Changed toest to use the print functions instead of the to_string functions

Changed vector_bool to bool_vector which I prefer

Removed string_to_address which is now in a separate file

New code - based on a copy of the string_* files

Tidy up and rearrange

Renamed polymorph to callback approach

Renamed polymorph to callback approach. Removed internals from header