Paramramp

Closes #41 (closed). Parameter ramps for offset, ramped matrix and others would never finish under certain settings. This was due to a delta value dropping below the precision limit for the value that's being ramped, leading to no change in the value.

This patch forces a minimum step based on the limits of double precision variables.

Tested against the cases described in the ticket and a few others.

Adds a bit of calculation to the ramp code.