Web bugs feb14th

Various small bug fixes:

 - #10393 Web didn't show Tags in tree that were added in Insight import dialog.
 - #9922 Selection of a Well didn't disable the delete toolbar button, which gave a dialog for deleting the Plate.
 - #10039 Datasets in the right panel had a 'Image count' which was unnecessary and got out of sync with changes in the tree. Same for Projects. Removed this info.
 - #10344 When the owner of a Private group switched to a different group, the Groups / Users drop-down didn't show other members of the Private group. Now it does.