You can now create directly from a Model

Added a param to create, which lets you say which Model to create.
Checkpoint

Progress towards making the create/edit UI smarter about properties
inherited from Models.
Checkpoint

Now displaying the Edit Button for inherited Properties.  Took some
head-scratching to get this working, due to a jQuery/Bootstrap conflict;
had to update Bootstrap and put in a workaround to get around it.

Also, widened the label area for inputs.  This is more hacked than I
like.
Checkpoint

Getting there.  The Edit button now does something reasonably
appropriate, making the field editable and setting focus to it.

Enhanced DisplayPropVal to actually know what property it contains,
which lets it be more powerful.

Made it easier to create a set of empty "prompt" Properties.
Checkpoint

We now change the edit button into a trash icon when pressed.
Checkpoint, but getting there

The Edit button now becomes a Revert button when you press it, and vice
versa.