Fixed over 500 compile warnings. Mostly:

* Unused variables.
* Missing newlines at ends of #included files.
* signed int loop variables where the termination condition is an unsigned 'get number of' function.
* 'NULL' used inappropriately for an integer or character constant (NULL is a pointer)
* abstract base classes with no virtual destructor.
* Floating point constants used to initialise integer variables.

Extras/ConvexDecomposition/ConvexDecomposition.cpp

@@ -337,9 +337,6 @@ void calcConvexDecomposition(unsigned int           vcount,
 			}
 		}
 
-		unsigned int fsize = ifront.size()/3;
-		unsigned int bsize = iback.size()/3;
-
     // ok... here we recursively call
     if ( ifront.size() )
     {