STLplus C++ library collection SVN stlplus3

First version of a class for managing dynamic-link libraries which provides a
platform-independent interface

Changed dependencies of strings and persistence libraries

Added documentation of platform directives

Standardised on ifdef for compiler/platform switches to make them easy to
search for

Containers library no longer has a lib file when linking

merged .cpp file into header to remove any requirement to compile this library

slight change to build message format

merged cpp file into header to remove the last requirement to compile this library

no longer needed - nothing to make

removing inter-library dependencies