#1 GCC 4.3 porting

[Santiago M. Mola]

GCC 4.3 is now much stricter with respect C++ standards. Here's a patch against latest CVS revision to make Polyworld compile with GCC 4.3.

Description of the patch:
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* GCC 4.3 porting changes (Rename C++ headers to standard ones, add missing C headers...). More info in http://gcc.gnu.org/gcc-4.3/porting_to.html

* A couple of char* -> string conversion. Seems that assigning constant strings to char* is deprecated.

* Remove conflictive goto statment.

[Santiago M. Mola]

polyworld-gcc-4.3.patch