MBS-7806: beta: url seeding is broken on /{entity}/create pages

ab45334 broke seeding of URL relationships via query string by removing
the code that converted FormHandler fields into JSON. Since that code
was always a source of bugs, I'm fixing this by adding a bit of JavaScript
to parse URL relationships in the query string, which is also icky but
hopefully less error-prone than trying to convert FormHandler crap into
JSON and then embedding it into the page.
MBS-7812: Beta: Edits from session storage re-entered from new edit form
Merge remote-tracking branch 'bitmap/mbs-7812' into beta

* bitmap/mbs-7812:
  MBS-7812: Beta: Edits from session storage re-entered from new edit form
Merge branch 'beta' into mbs-7806
Use MB.formWasPosted var to determine whether to parse seeded URLs
Merge remote-tracking branch 'bitmap/mbs-7806' into beta

* bitmap/mbs-7806:
  Use MB.formWasPosted var to determine whether to parse seeded URLs
  MBS-7806: beta: url seeding is broken on /{entity}/create pages
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