Ensure Mercurial directory hierarchy is preserved on install

This is an update to 8a2c434 Include Mercurial in Linux package

Change-Id: Ie2237e8c3dc311c21df1ed6bf8eab157f4702cd7
Fix display problem in Dictionary Browse & Edit

Either the fields were scrunched up together in the upper left corner
of the detail area without being laid out at all, or various fields
were too high, or various fields were spread too far apart.  Some of
this was due to an earlier over-optimization.

Change-Id: I0c41fc9c20c755f2295eb7763ed5ea81d70d8a5b