Starting attack at fmpz_mpoly

added missing fmpz_mpoly_sort_terms to _flint.pxd
updated fmpz_mpoly_context to include names and other term orders
Fixed up arithmetic to use python 3 protocol and removed automatic
conversion.

src/flint/_flint.pxd

@@ -2397,6 +2397,8 @@ cdef extern from "flint/fmpz_mpoly.h":
     void fmpz_mpoly_get_term_monomial(fmpz_mpoly_t M, const fmpz_mpoly_t A,
                                               slong i, const fmpz_mpoly_ctx_t ctx)
 
+    void fmpz_mpoly_sort_terms(fmpz_mpoly_t A, const fmpz_mpoly_ctx_t ctx)
+
     # Addition/Subtraction
     void fmpz_mpoly_add_fmpz(fmpz_mpoly_t A, const fmpz_mpoly_t B, const fmpz_t c, const fmpz_mpoly_ctx_t ctx)
     void fmpz_mpoly_add_si(fmpz_mpoly_t A, const fmpz_mpoly_t B, slong c, const fmpz_mpoly_ctx_t ctx)