fix in explicit template instantiation syntax which was wrong, but accepted

by gcc and icc (!). Remove TObjPtr class which is now just an instantiation
of TObjNum<void*> (for backward compatability we provide the typedef:
typedef TObjNum<void*> TObjPtr;). Remove reference to TObjPtr.h from
TBuffer.cxx. To compile make sure to remove base/src/G__Base1.d,
base/src/G__Base2.d, base/src/G__Base3.d and base/src/TBuffer.d.


git-svn-id: http://root.cern.ch/svn/root/trunk@5739 27541ba8-7e3a-0410-8455-c3a389f83636