changed q1bsp loader to allow more than 32768 nodes, as long as the

changed q1bsp loader to allow more than 32768 nodes, as long as the
total of nodes+leafs is <= 65536, it also attempts to fix corrupt BSP
trees by changing invalid references to instead use the solid leaf (so
you can't walk into a corrupt area), this was done to allow loading of
maps compiled with arguire's qbsp utility that can produce corrupt bsp
files

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@7593 d7cf8633-e32d-0410-b094-e92efae38249