STLplus C++ library collection SVN stlplus3

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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Major reworking to split STLplus into separate k=libraries and split the files
too into more manageable sizes

Test the inf class and it's data persistence

Changed the namespace to suit my preference now