Gen. popup impl. #7, TinyMCE Link picking

* Fixed TinyMCE editor handling for multiple instances; link picking now
is multi occurence too
* Link picking now is truly "generic", and works 100% in browser session
memory, rather than requiring to persist data server side after picking
a link.
* Added function that returns the current active thickboxtemplate.
* The findclassidentificationwithprefix to identify classes now supports
alfa characters too <div class="nxs-object-123abc"> could return
"123abc"