Revert "Add ability to carry out registration in RAM"

This reverts commit 04a83636e80da71796617ec848a473551f08d877.
Merge branch 'master' of https://github.com/robertb-r/fiji

Conflicts:
plugins/Scripts/Plugins/Registration/Correct_3D_drift.py
qMerge branch 'master' of https://github.com/robertb-r/fiji

Conflicts:
	plugins/Scripts/Plugins/Registration/Correct_3D_drift.py