MapScript needs to run msSetup/msCleanup automagically

[sdlime]

This really applies to multiple components but I had to pick one, so MapScript-
SWIG gets it. This stems from the use of the GEOS C api which requires us to 
call a GEOSinit() and GEOSfinish() when using the library. You definitely want 
to do that only once when MapScript or the CGI are loaded. The MapServer C code 
already defines a couple of functions msSetup/msCleanup to do this. They are 
being used for some OGR cleanup and so on. These would be logical places for 
the GEOS functions. Besides that we need to:

  - add them to PHP's MSINIT and MSHUTDOWN functions
  - add them to language specific interface files for all relevant SWIG 
languages. Python is done (at least for msSetup), so Perl, Ruby, C# and Java 
need to be done.
  - add them to mapserv.c, being mindfull of fast CGI support

Steve