Fixes#2772.
The current implementation of `rnd_i` incorrectly casts `f` (an `f64`)
into an `i64`, before casting it into an `Integer`.
This fixes that issue by using `Integer::try_from(f)` instead,
and failing if `f` is infinite or NaN.
A fixme is left for a future PR to properly handle the resulting errors
in floor/1 and friends (right now they can only be triggered through FFI).
This fixes#2725, by making it so that `strip_module(Pred, M, P), call(M:P)`
doesn't throw an `instanciation_error` when `Pred` isn't in the form `module:predicate`.
Now, `strip_module(hello, M, P)` will call `load_context(M)`, which unifies `M`
with the topmost module (or `user`).
Two new test cases are added: issue2725.pl, which tests the minimal case id(X) --> X.
and the strip_module(P, M, _), call(M:P) scenario, and module_resolution,
which tests the behavior of strip_module in a few scenarios.
Emilie Burgun