fix the name of a property in the UI (for S)

It looks like it would be a bit more involved to support checkbox inputs
being checked by default, and it also would currently always put
jr:noAddRemove="false()" when leaving out the property is sufficient.
remove itext id from form content export (Case:56308)
Merge pull request #50 from dimagi/fix-rename

fix rename instead of reverting it
minor refactor, remove unreferenced event
remove unused multimedia upload in vellum
unnecessary events
fix issue with duplicate nodes in UI (Case:50777)

unnecessary extra reloadUI call would result in duplicate nodes being
created for any that occured after 400 milliseconds after calling it
because loadXForm() calls resetFormDesigner() which resets the UI and
then reloadUI(), after 500 milliseconds.
Merge pull request #51 from dimagi/duplicate-nodes

fix duplicate nodes
Merge branch 'master' into repeat-add-remove
Merge branch 'master' into export-columns
add non-default languages to form content export for image, audio per amelia
Merge pull request #52 from dimagi/repeat-add-remove

Repeat add remove
remove vunused variable
fix Case:58845 (missing error when display text but no question itext id)
fix Case:58847 (adding a question takes painfully long on large forms)

Currently when you add a question on a large form it can take several
seconds.  This is because every time a question is added every single
question in the form is validated in order to redraw the error icons
in the question tree.

This change removes that and makes adding a question snappy on even very
large forms.

Revalidating all questions seems unnecessary because this is already
done on form load and when you change a question that question itself is
automatically validated.

Since by default questions are created in a valid state (non-duplicate
question id, etc), adding a new question never introduces new validation
errors until the question is edited to be invalid, and anyway if the
question wasn't created in a valid state you would see an error as soon
as you edited it.

As far as I can tell validation only occurs isolated to each individual
question and there is no structural validation except for a few things
like unique question IDS.
Merge pull request #54 from dimagi/case-58845

fix missing error when display text but no question itext id (Case:58845)
Merge pull request #55 from dimagi/case-58847

fix Case:58847 (adding a question takes painfully long on large forms)
Merge pull request #53 from dimagi/export-columns

remove itext id from form content export
toolbar is ready, awaiting input
removed unnecessary log statements