Don't render headings for tabbed fieldsets

(the tab itself already shows the tab title)
Merge pull request #336 from jurianeven/feature/notabheadings

Don't render headings for tabbed fieldsets
Merge pull request #341 from akeeba/master

Resync dev with master
+ Tooltip support for F0FForm fieldsets
Use native Joomla tooltips for F0FRenderJoomla and F0FRenderJoomla3. Use Bootstrap tooltips for F0FRenderStrapper. Also refactored F0F renderers.
Uncomment renderFieldset() and renderFieldsetLabel() at F0FRenderAbstract and convert them to regular methods (thanks, @nikosdion!)
Remove Strapper HTML from F0FRenderJoomla. It's less prettier but else backward compatibility would be broken.
Don't render whitespace inside <label>
The HTML classes should be fof (f-oh-f) not f0f (f-zero-f)
Merge pull request #340 from jurianeven/feature/tooltip

Tooltip support
Wrap backend output in various classes and add #akeeba-strapper.

Also refactored preRender(): return immediately when $platform->isCli()
Rename akeeba ID of F0FRenderJoomla and also add classes to F0FRenderJoomla3
Merge pull request #342 from jurianeven/feature/classes4

Wrap backend output in various classes and add #akeeba-strapper.
Fixed checking conditions for type "type"
Merge pull request #343 from akeeba/feature/fix-db-installer

Fixed checking conditions for type "type"
Strapper: Fixed compiling mixins.less

See also: https://reviews.apache.org/r/14110/diff/
~ Only show ordering input fields and save button when rows are ordered by ordering (Joomla! 3)
Reverting change to mixins.less
Merge branch 'refs/heads/jurianeven-feature/ordering' into development
Updated Bootstrap to version 2.3.2