GiNaC/ginac basic.cpp function.pl idx.cpp idx.h indexed.cpp indexed.h symbol.cpp tensor.cpp tensor.h

[Christian Bauer]

Update of /home/cvs/GiNaC/ginac

Modified Files:
	basic.cpp function.pl idx.cpp idx.h indexed.cpp indexed.h 
	symbol.cpp tensor.cpp tensor.h 
Log Message:
- subs() can be used to substitute functions, tensors and indexed objects
- op(0) of an idx object returns the index value; a nice side-effect of
  this is that idx'es no longer all have the same hash value
- added checks for clifford class