Change  -> /Users/will/Desktop/OMERO/dist in Web/CreateApp. See #11373
use warning box to warn of loss of users' data
Merge pull request #485 from joshmoore/rebased/develop/OMERO_HOME_for_web_devs_11373

Omero home for web devs 11373 (rebased onto develop)
Merge pull request #486 from mtbc/rebased/develop/warn-data-loss

put permissions warning into a proper warning box (rebased onto develop)