Rewrite the mwrank interface to get rid of wrap.cpp

[williamstein]

CC: @JohnCremona

Component: interfaces

Issue created by migration from https://trac.sagemath.org/ticket/1949

[williamstein]

Attachment: trac-1949-mwrank_rewrite_part1.patch.gz

this is part 1 -- it doesn't even build yet, but all functions are there...

[williamstein]

comment:2

NOTE: There is code in ell_rational_field.pyx that refers to trac #1949 that should be changed/removed when this ticket (#1949) gets finished.