converting picoseconds to micro and milliseconds

[DeamonDev]

There is only one function which converts DiffTime into numeric value which is diffTimeToPicoseconds. I don't see any reason to distinguish picoseconds from the other time measurement units. Lot of other libs in the Haskell's ecosystem accepts microseconds (e.g. threadDelay from Control.Concurrent). Of course it is very easy to do the conversions on its own, but I think we should pull this out in front of the parentheses (and it is the right place to do so). My proposal is to add two other conversions which are diffTimeToMicroseconds and diffTimeToMilliseconds.

[AshleyYakeley]

Integer picoseconds is the internal representation of the DiffTime type, that's the only reason for diffTimeToPicoseconds. Milliseconds and microseconds would not be integers.

[DeamonDev]

Okay, good point. But what about taking a floor function over the resulting fractional?

@edit The quot function is taking care of that.

[AshleyYakeley]

I would prefer to avoid the proliferation of trivial functions.