Fixed an issue in the evaluations module which was causing the vertical matrix and the drop down question types to miss some required processing, and in particular- not fetch the associated objectives on the edit page.
Added missing "Descriptor" column heading for the question add/edit interface in the evaluations module.
Made descriptor text a label that refers to the radio button for the descriptor, so that the descriptor text can be clicked to select the descriptor for a question, rather than just having to click on the radio button itself. Additionally added some additional styling to the dialog to make it a bit nicer/clearer to use; though it still likely needs some work or at least thought towards how it should operate.
Changes X-Frame-Options header from DENY to SAMEORIGIN.

This fixes problems with iframes not displaying their contents because the header was set to DENY. File upload wizards and other multi-page popup forms that use ajax post to a named iframe so they need to be displayed.

SAMEORIGIN is no less secure than DENY, as it will still protect against clickjacking and cross-site framing.
Fixes a bug with mismatched parentheses in function courses_fetch_courses.

I also removed the strtolower call because the group name strings are lowercase to begin with.
Merge branch 'develop' into feature-course-community-synch