* replace all instances of PTRVALID(ptr,size) by (ptr != NULL)
* remove asserts of style ASSERT( x == NULL || x != NULL ) because they would evaluate to true always anyhow and as such wouldn't ever trigger
* remove macros iV_HeapAlloc and iV_HeapFree and replaced them with MALLOC and FREE respectively (that's what they expanded to anyway)
git-svn-id: svn+ssh://svn.gna.org/svn/warzone/trunk@1348 4a71c877-e1ca-e34f-864e-861f7616d084