Update Blitz.setChannelNames doc
Hide channel-edit button while editing
Update confirm message and 'Continue' button
Fix channel naming NPE when no $.jstree. Reported in PR 606
Show warning message renaming Well channels on 'Enter'

Conflicts:

	components/tools/OmeroWeb/omeroweb/webclient/templates/webclient/annotations/metadata_general.html
Fix tooltip caps and non-ascii characters
Don't try to cast unicode Channel name to str()