okay. I can't read. we already had a multiline config. It's the default.
So I reverted my change, except for making use of formText/cleanText for
proper line ending handling and I added made focused textareas a bit
larger.

* code/PHP5 cleanup

* fixes merge messup (code was made up from parts of authad)
* code and PHP5 cleanup

* use proper plugin config
* code/PHP5 cleanup

* makes proper use of plugin config
* adds a few first defaults, but the whole config metadata is still
  missing
* proper PHP5 use and comments

* fixes incorrect $this->adldap calls
* makes use of correct plugin config

This does nothing currently but allows us adding certain things
to the base class later.

* added more selectors to allow different markup
* added border to make tabs more distinctive, especially in other templates

#2541, alter section highlighting to insert a container into the DOM to hold the elements being highlighted & later remove it

note: we recommend to NOT use H1 elements in the sidebar for semantic
reasons