Revert "Merge pull request #2831 from dimagi/revert-vellum"

This reverts commit b3345eae872e9c3c3810ac2f78757a6523a0d6f2, reversing
changes made to 5be1de723d3563157dbe9d6aa4fbc58dca80376e.
Merge branch 'master' into vellum-includes

Conflicts:
	corehq/apps/app_manager/templates/app_manager/form_designer.html
Remove limit on ids passed to case ES query
added subtitle and place to signature, removed logo and 'branch name' column in beneficiary payment report
Added ability to remove unassigned user role.
add user registration attachment xml to app.json
only ignore data in root
add auto-select model
autoselect in suite.xml
pep8
check case tag in autoselect
add raw autoselect
remove print statement
update commcare version on copy

including from exchanage
Add CommTrack to feature previews
Fixed tests and added support for old snapshots
removed 'PNC status' column and refactored 'visit_completion' calculations
fix tests that involve importing apps
Update CommTrack description in Feature Previews
Text changes