STLplus C++ library collection SVN stlplus3

Added more tests of persistence corresponding oto the examples in the docs

Bug fix - error in converting code from STLplus 2

More complete examples of using persistence

Removing Visual Studio 6 project files - no longer supporting these

Renamed to be more descriptive

Added some complete examples in downloadable form

Corrected the example - there was a misnamed parameter and some errors
in the use of namespaces.

Changes to build system, file system and IP sockets

The functions for differentiating between a file and a folder did not
handle 'other' filesystem objects correctly. I have now defined a file
to be a regular file, symbolic link (Unix only), socket (Unix only) or
named pipe. A folder is defined as just a directory. Character devices
and block devices (Unix only) are neither files nor folders.

Visual Studio headers now define some constants that I had to define
locally, so put a compiler switch to define them only for older compilers.