When confirming deleting an event, changed OK/Cancel to Yes/No and added
some distance between those uncomfortably close buttons.

Improvements in how incoming parameters are handled, how $editing is handled.
More consistency across course formats for editing stuff, using $PAGE.

Also a "bugfix": when turning editing off, cancel moving an activity if you
were in the middle of doing so.

Removed dead code.

Lots of improvements in markup and styles for courses.
Finalized and correctly distributed the calendar styles.

Vastly improved styles, lots of inline styles removed, markup improved.

Fix for bug 2532:

Due to some restructuring a notice went into the upcoming events block.
I didn't have that one on so I didn't notice (no pun intended) :)

copied strings from moodle.php to admin.php

The table on view.php now also shows the marks achieved in each attempt in addition to the rescaled grade.

Fixed styles and improved lots of things in calendar. It should work all
right and even be a bit cooler than it was before. :)

Updating the guide and some comments to be up to date with the latest
and greatest inner workings. sigh.

Styles and markup improvements.