GiNaC/ginac ex.h ptr.h symbol.cpp symbol.h

[Christian Bauer]

Update of /home/cvs/GiNaC/ginac

Modified Files:
	ex.h ptr.h symbol.cpp symbol.h 
Log Message:
- added some (empty) exception specifications (reduces code size a little)
- synced to 1.1 (ex::const_iterator::operator[])