[Biopython] Bio.PopGen.SimCoal partial deprecation

[Tiago Antao]

Dear all,

With the availability of the new fastsimcoal interface by Melissa
Gymrek, I was planning on deprecating the code to deal with old version
(SimCoal 2.0).

This would mean deprecating
class SimCoalController (Bio.PopGen.SimCoal.Controller.py), along with
the relevant test code (and SimCoal2 dependency).

All the other code would be maintained (e.g. templating). And Melissa's
new fastsimcoal class (FastSimCoalController) would of course be added.

If somebody has strong feelings against this deprecation, please do
voice your concerns.

Best,
Tiago