[IMPROV] Explicit division usage

As with Python 3 one slash (/) is always a float division and two are
always an integer division. This behaviour is enableable via a __future__
import. This changes all implicit integer divisions to explicit ones and
removes all manual float casts.

Change-Id: I3bdb944db4915553e53a9060a9b01b1739fa8807
Merge "[IMPROV] Explicit division usage"