Fix/cdodge/signup tweeks

polished import progress bar

changed save unit alerts to toast

polished new course form

don't show courses/create new course if account has not been activated. ...

don't show courses/create new course if account has not been activated. Also better error messaging on failed logins. Also redirect to index after signup.

fix preview draft link. We need to generate the link target url directly...

fix preview draft link. We need to generate the link target url directly rather than using jump_to. I think jump_to is not properly finding the draft objects and needs more investigation

always hide the pages button. We don't want it appearing in case someone...

when calling jump_to when location=<id-of-sequential> then Position is b...

when calling jump_to when location=<id-of-sequential> then Position is being computed as None. The redirect then yields a 404. Force Position to be 0 when Position=None

remove the — from the HTML, this apparently is causing the CAS and...

remove the — from the HTML, this apparently is causing the CAS and LMS to barf on staging, but strangly not on dev

remove HTML comment from schematiceditor template

fix exception in LMS when rendering newly create multiple choice problem...

fix exception in LMS when rendering newly create multiple choice problems. The capa module is barfing on the HTML comment which was in there and the XML parser couldn't handle it.

Fix/cdodge/cas bugs

Conflicts:
	cms/templates/widgets/header.html

Fix/cale/edge bugs

Conflicts:
	cms/static/js/base.js

save_item should also do proper 'is this element draft aware' logic so that incorrect versioning occurs on elements which do not support versioning at this point in time (aka courses, sections, and subsections).

Feature/cdodge/cas new course