[GiNaC-devel] Improvement for epsilon tensors.

[Chris Dams]

Dear GiNaCers,

I modified the functions that construct epsilon_tensors in tensor.cpp.
They now test whether their arguments are wildcards. In that case these
tensors remain unevaluated. The problem is that if one tries to
use .find(epsilon_tensor(idx(wild(0),2),idx(wild(1),2))) this may get
"simplified" into -epsilon_tensor(idx(wild(1),2),idx(wild(0),2)) thereby
obstructing the find method. This change is in the same patch as I
applied to CVS in order to revive the return_type_tinfo system.

Best,
Chris