ExporterI: set tile size for exported files to 128x128

This prevents the OME-TIFF writer from writing each row of pixels as a
separate strip, which should improve performance upon re-importing the
exported file.

See ticket #11850.
Play movie across small t if number > 1.
Reset icon when no longer playing movie across t.
Update correctly the T for FLIM series.
Update date in header.
Fix possible NPE when no project associated to a user.
Use the default group if groupId < 0 See #11954
Disable concurrent Quartz scheduling of indexing  (see #11945)

With Quartz concurrency enabled, the indexer appears to be getting stuck
in a deadlock when one or more thread experiences an OOM error. Since,
currently, only one thread can index at a time anyway this disables
concurrency in Quartz as a workaround.
Initial commit to replace menu by Checkbox menu.
Add option to add all the users.
Add/remove users to tree.
Allow to remove logged-in user from the display.
Enabled selection if no user displayed.
Add selection icon.
Do not allow group selection in user view.
Review the group menu in group display view.
Replace 16x16 icon by 8x8 icon.
Do not visit the browser when groups >1.
Fix selection of users in menu.
Remove the last group.