GiNaC/ginac ex.h ex.cpp

[Christian Bauer]

Update of /home/cvs/GiNaC/ginac

Modified Files:
	ex.h ex.cpp 
Log Message:
- implemented object fusion as proposed by Richy
- unit(), content() and primpart() take a "const ex &" instead of a
  "const symbol &". degree(), coeff(), collect() etc. have dropped the
  restriction to symbols a long time ago, so there's no reason for these
  function to keep it.