BUG: Match Convergence Window Precision

When computing registrations, the convergence windows computations
should be done in the same precision as the registration framework
in order to keep the computation precision consistent.

Change-Id: Id9d8724bc4fdc573b2d9b792c5dbc1d3f6fb36a2
Merge topic 'ConvergenceWindowMatchType'

5189a19 BUG: Match Convergence Window Precision