WIP #428
WIP #428 Selectable areas for group/forum settings

Cleans settings.php
WIP #428 Selectable areas for group/forum settings

I forgot the obvious ones :P
WIP #428 Selectable areas for group/forum settings.

Updates the upgrade script for post merge settings.
WIP #428 Selectable areas for group/forum settings.
Fixes #517 'emailpmnotify' causes SQL error
Adds SCEditor To ACP Edit Sig

working toward #251
WIP #428 Selectable areas for group/forum settings.

Updates option code.
Merge remote-tracking branch 'upstream/feature' into wip-428

Conflicts:
	inc/languages/english/admin/global.lang.php
	portal.php
Merge pull request #519 from Sama34/wip-428

Implements #428 Selectable areas for group/forum settings.
Fixes #647 registration form submission bug

Debug left over
Fixes #636 Login modal can't be used twice

I ended up adding an option to the modal plugin so that we can tell the
modal plugin not to delete the element (this last point was added to the
plugin some time ago to allow for multi-modal with same IDs).
Merge pull request #615 from WildcardSearch/sceditorsig

Adds SCEditor To ACP Edit Sig
Merge pull request #609 from PaulBender/fix-feature-517

Fixes #517 'emailpmnotify' causes SQL error
Upgrading SCEditor and Select2 to latest versions
Merge pull request #1 from mybb/feature

Update from original