GiNaC/ginac ptr.h Makefile.am expairseq.cpp expairseq.h idx.cpp registrar.h symbol.cpp symbol.h

[Christian Bauer]

Update of /home/cvs/GiNaC/ginac

Modified Files:
      Tag: ginac_1-2
	Makefile.am expairseq.cpp expairseq.h idx.cpp registrar.h 
	symbol.cpp symbol.h 
Added Files:
      Tag: ginac_1-2
	ptr.h 
Log Message:
- added ptr<T> template for reference counted handles in ptr.h
- symbol uses ptr<assigned_ex_info> instead of assigned_ex_info*
- removed unnecessary copy control in symbol class
- T::duplicate() returns T* instead of basic*, avoiding some casts