GiNaC/ginac clifford.cpp clifford.h tinfos.h

[Jens Vollinga]

Update of /home/cvs/GiNaC/ginac

Modified Files:
	clifford.cpp clifford.h tinfos.h 
Log Message:
Added contribution from Vladimir Kisil: generalization of clifford algebra:
* different metrics can now be defined for clifford
* new class "clifford_unit" to represent generators of the algebra