GiNaC/ginac matrix.cpp matrix.h

[Richard Kreckel]

Update of /home/cvs/GiNaC/ginac

Modified Files:
	matrix.cpp matrix.h 
Log Message:
* matrix:;pow(): Fix exponent==0 case.
* matrix::print(): Implement print_latex.
* Add unit_matrix(unsigend) and unit_matrix(unsigned,unsigned).