RELEASE: v1.7.25

[Warren Young]

Another mostly-cosmetic release:

     o Yet more fixes to the --with-mysql-lib and --with-mysql-include
       flags.

     o Added DLLEXPORT stuff to platform.h, hopefully so that someone
       can figure out how to make VC++ make a DLL version of MySQL++.

     o Renamed *.cc to *.cpp.

     o Made 'set -> myset' change in VC++ project files.

     o Some style changes (mostly whitespace) in header files.

As always, it is available at http://tangentsoft.net/mysql++/