Editing oddities

[david]

• tab doesn't work between fields
• if you select another item while the current item is being edited (field is open), changes are lost.
• changing the creator type is über-confusing

(listed as one because I will majorly rework this component and have one fix for all of these)

[dstillman]

#211 created for creator type drop-down

[dstillman]

(In [551]) Addresses #126, Editing oddities

• Added support for tabbing between fields, which unfortunately we don't get for free from tabindex because of what we're doing with labels and textboxes. (The textbox being tabbed away from is deleted before the blur() completes, so it doesn't know where it's supposed to go next.) Basically replicated the built-in functionality for all the text fields -- can add on special tricks for creator adding/removing later.

• Increased spacing between rows slightly and adjusted margins to get rid of shifting when switching between label and textbox -- this also fixes the annoying clicking-off-a-textbox-to-the-lower-portion-of-a-label-below-it-doesn't-select-the-label problem.

[dstillman]

(In [602]) Closes #126, Editing oddities

blur() isn't called automatically when clicking directly off a field to another item in the middle pane, so we force it