GiNaC/ginac clifford.cpp color.cpp indexed.cpp indexed.h

[Christian Bauer]

Update of /home/cvs/GiNaC/ginac

Modified Files:
	clifford.cpp color.cpp indexed.cpp indexed.h 
Log Message:
- Clifford traces of many gammas are a lot faster now (especially with gamma5)
- new simplifications for color classes:
    d.abc T.b T.c = 5/6 T.a
    f.abc T.b T.c = 3/2 I T.a
- added indexed::has_dummy_index_for() member function