Added access functions for gNumGjkChecks and gNumDeepPenetrationChecks.
These globals are now in an anonymous namespace.  This fixes DLL linkage
issues with global variables.
Replaced global access of variables gNumClampedCcdMotions and
gNumClampedCcdMotions with global access functions.  These fixes DLL
linikage issues.
Replaced global access to the DNA strings with global access functions.