STLplus C++ library collection SVN stlplus3

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

Added ./ prefix on running command in case . is not on path

Add test for passing a parametrised template function as a parameter to
another function

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