#40 Corrupted output for sparse_polynom<residue>

[Sergey S. Lyalin]

Where: trunk #366.

For polynomial x^2-x+0(mod 5) (yes, with exact 0 in the end, yes, it is not normal polynomial) represented as sparse_polynom<residue<big_int> > we have the following output "x^2-x0(mod +5)" by operator<<. That's ugly. It should be "x^2-x+0(mod +5)" or, even better "(x^2-x+0)(mod 5)" or something like this without strange "-x0" at the end.