ENH: Give user control over the number of decimals in spinboxes

Adding decimals is now possible in spinboxes.
Note that this work is orthogonal to units but not incompatible.
Closes #2973, #2986

git-svn-id: http://svn.slicer.org/Slicer4/trunk@22151 3bd1e089-480b-0410-8dfb-8563597acbee
ENH: Add control over decimals in Transforms module

Closes #2480, #2579

git-svn-id: http://svn.slicer.org/Slicer4/trunk@22152 3bd1e089-480b-0410-8dfb-8563597acbee
BUG: Disable auto enabling for qMRMLCoordinatesWidget

The dimension coordinate widget in Volumes should stay disabled.

git-svn-id: http://svn.slicer.org/Slicer4/trunk@22153 3bd1e089-480b-0410-8dfb-8563597acbee