GiNaC/ginac clifford.cpp normal.cpp

[Christian Bauer]

Update of /home/cvs/GiNaC/ginac

Modified Files:
	clifford.cpp normal.cpp 
Log Message:
- collect_common_factors() works better with negative powers
- simplify_indexed() converts "gamma~mu*p.mu" to "p\"
- fixed a bug in canonicalize_clifford() when gammaL/R were in a string