Disable AJAX for AnimationPane form

[#52818341] Until I can get the AJAX refresh of this form working properly in Hobo, this version just disables it. This means we're providing form fields which are sometimes required and sometimes not, so obviously this isn't optimal, but at least it works.

https://www.pivotaltracker.com/story/show/52818341
Renaming the xMin and xMax for clarity

[#52818341] It irks me that Hobo doesn't provide a simple way, in the form tags, to provide a human-readable name for the field being requested. The best I can do is rename the fields and hope Hobo chooses to interpret them in a readable way.

https://www.pivotaltracker.com/story/show/52818341