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

[Christian Bauer]

Update of /home/cvs/GiNaC/ginac

Modified Files:
	add.cpp clifford.cpp clifford.h tinfos.h 
Log Message:
- added Dirac gammaL and gammaR objects (chiral projectors)
- fixed a typo in add.cpp