Add the padic_poly module.
Adds the module "padic_mat"
Improves padic_poly_add/sub().
Improvement to padic_poly_neg.
Adds padic_poly_randtest_val.
Initial commit for the "qadic" module.

Please note that I am only pushing this commit
in its current form to ease discussion with other
people;  it is not intended to be fully functional
or well documented at this point.  I aim to catch
up on this before the weekend.
Update to "qadic", including lots of documentation.
Adds test code for qadic_pow()
Improve test code for qadic_sigma, also includes products now.
Modifies qadic_sigma() to take a second parameter e.
Improves qadic_sigma().
Fix for padic_mat.h, removing include of mat_common.h.
Improves qadic_teichmuller.
Rename qadic_sigma to qadic_frobenius
Include Paterson-Stockmeyer in qadic_frobenius
Small changes to qadic_frobenius
Small improvement (~ 2.5%) to qadic_inv.
Update to Makefile.in, including "qadic".
Remove a header from qadic/inv
Adds qadic_exp()