Cascade field change events on bug form, simplify reflow code on query form
Remove #cf_sprint specific style
Save valid_attributes in cache_fields (fixes crash after enabling a field)
Show "None" for empty BUG_ID_REV fields
Rewrite group control help text
Fix readonly display of bug fields; move keywords code away from [% BLOCK input %]
Fix scrum cards js pasting
Fix js errors on readonly fields
Experimental implementation of select fields as hinted editboxes
Begin implementation of "custom" editable object classes.

* Separate 'class' and 'field' entities. Previous Fields were a combination of both a Field and a Class.
* Turn Component, Version, Milestone, Keywords, OS, Platform, Status and all custom select field value classes into generic classes.
  Remove most of their custom DB interaction code.
* Remove separate Milestone and Version CRUD user interfaces, edit them using generic UI.
* Allow to view history of generic objects.

TODO:
* Editor for generic classes and their fields.
* Deal with possible form field name collisions.
* Support search on generic objects.
* Add "display" pages for generic objects and decide how they should
  relate to object edit pages (for example, it's the same page for bugs).
* Add object-level and field-level permission system.
* Support generic "autocompleted editbox" view of select fields,
  without the need to dump all values into client JS.