Sorting is now configurable through a sorting dialog, including the ability to...

Sorting is now configurable through a sorting dialog, including the ability to enable/disable sorting and set table size limits for automatic enabling of sorting on either the point or measure table. Fixes #360.

git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/trunk@4201 41f8697f-d340-4b68-9986-7bafba869bb8