Slicer/Slicer — pull request #213 by naucoin (2014-12-31 20:52:25+00:00)
Title: BUG: fix coordinate display and add distance

The right click menu on the Markups GUI wasn't always showing the
correct coordinates as there were some assumptions about how the
selected items mapped to rows. Take out the assumptions, iterate
through every selected item and collect unique rows.

Show the summed linear distance between selected fiducials.

Issue #1898