p/68182628 b/13637155 Automatically adding owner on create only to specific types
Supporting preload of certain values when modal is spawned
Removing commented-out code
Minor cleanup tasks

* Remove empty/unused `Cachable.set_owner_to_current_user_if_unset`
  method
* Remove `ownable` mixin from CategoryBase, Option, and Help (which are
  not "ownable" objects)
* Remove `before_save` from Program, since Program should not be
  `Ownable`
Merge remote-tracking branch 'origin/develop' into feature/owner-contact-mixins

Conflicts:
	src/ggrc/assets/javascripts/models/cacheable.js
Fixing location referencing in related_graph
Merge pull request #1161 from reciprocity/feature/owner-contact-mixins

Restrict conditions and types under which owner and contact is set by default.