The bug was in filter_current_assessments() being applied before get_unkept_assessments()
so actually no current assessment records could be detected.

MDL-21233 escaped parameter is far more importatnt than the overrideparams in out() method - especially all JS urls should be converted to out(false); also it is possible to create new url with overrided parameters in constructor which might be actually work around the double encoding problems in the url (we should never use the out() in moodle_url constructor itself!)

Moving stuff from lib.php into static methods in localib.php. Removing
things from workshop core that were implemented in a subplugin. Dropping
stuff related to features not to be implemented in 2.0.

Getting a context from instance is very cheap and I can actually do it
just once when constructing the workshop API class. In the future, I
will get rid of all $PAGE->context which is actually meant for things
like blocks etc.

DB columns userid renamed to authorid or reviewerid to make the value
clear. Improved manual allocation UI. Raw grades are stored as numeric
values from 0.00000 to 100.00000 (instead of the current 0 to 1) to be
more precise. Started to work on the Grading report (it est the overall
report of all grades form submission and grades for assessments).

Did not display properly with dozens of users

See the issue description for more details

Critical issue fixed here: after recent refactorings, I called
get_users_with_capability() inside the loop in another loop! (oops :-)
This was used in my very first code using the renderers. I have learnt
I should follow the core approach (as suggested by Tim) to prepare a
data object and pass it to the renderer. The fact the renderer called
a workshop method indicated something was really wrong...

WIP

I do not agree with using object() class for no real reason.

Some small refactoring like using single function to group users done.

Every action script in 99% starts with fetching course, course module,
and module instance record. Workshop class will keep the reference to
the course record in courserecord public member variable (do not confuse
with course integer property).

Random allocation implemented. More testing needed.

Initial sketches of random allocator. Refactoring of the rest of the
module here and there. Also, this commit removes trailing whitespace and
running empty lines.