Backlog: Entry: Bring focus to appropriate input

When clicking on 'story' or 'deadline' bring
the focus to the associated textboxes.
Backlog: Mark deadlines as .selected, too

Deadlines / mileposts can be '.selected' just
like all the other story types. This was probably
an artifact of how the css was in the past.
Refactor: Backlog: Remove unused code

Remove some of the code that has been commented-out
for a while now, and a couple things that are no
longer referenced.