Deprecating fromIntegral

[Niklas Hambüchen]

> I'm -1 to changing the behavior of fromIntegral now

I never suggested to change the behaviour of fromIntegral.

I even argued against that twice:

* once in my original email (saying we should deprecate the current
fromIntegral but keep it forever for backwards compatibility)
* once in my reply to Edward ("unchanged semantics, but emitting a
deprecation warning")

> but +1 on adding other
> functions to make the behavior more explicit.

Then you are +1 on my proposal, because that is exactly what I wrote.