Change to_int, coerce_to_int to coerceToLongInteger.  Part 1.

Added the functions, changed most calls away from (coerce_)to_int, but
tests have not been run, and not all integer versions are done.
Change to_int, coerce_to_int to coerceToLongInteger.  Part 2.

All examples, tests in Macaulay2 succeed.
CoerceToLong, part 3.

Now flint and ffpack finite fields can be used in factorization. The
max characteristic for factory is 2^29.