Merge pull request #483 from sbesson/rebased/develop/scc_rebase_continue

Rewrite the description of the `--continue` option in `scc rebase` (rebased onto develop)
Change  -> /Users/will/Desktop/OMERO/dist in Web/CreateApp. See #11373
use warning box to warn of loss of users' data
merge develop -D org -I include -E exclude: PR 450 (omero: Python 2.6 is the minimum supported version)
merge develop -D org -I include -E exclude: PR 485 (Omero home for web devs 11373 (rebased onto develop))
merge develop -D org -I include -E exclude: PR 486 (put permissions warning into a proper warning box (rebased onto develop))