A few bugs (and fixes) relating to the handling of grades:

• In the scheduler settings screen (mod_form.php), it is not possible to change to any other grading scale than "100". When selected differently, the setting will not be stored. [Reason: incorrect field name used. I also changed the default to "no grading".]

• Throughout the module, grades will sometimes be displayed even if the scheduler is set to "no grading".

• If a custom grading scale is chosen, grades will still be displayed numerical.

A diff is attached.