[Python] Allow ints to be considered as floats/complexes and floats as complexes

[hjtran]

Currently, python Beam transforms will complain about type incompatibilities if you try to supply ints for floats/complexes or floats as complexes. It's not hard to work around this but it comes up fairly often and is a bit tedious to fix over and over when ints work fine in place of floats/complexes.

PEP484 states that ints should be compatible with floats/complexes and floats as complexes, so this change just updates our type check to allow for these special cases

Dev mail thread on this

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[jrmccluskey]

LGTM, thanks!

[robertwb]

LGTM, thanks for fixing this!

[robertwb]

(Looks like there's a couple more tests to update.)