Bug 10694: (follow-up) fix various issues

Bug 10694: (follow-up) fix various issues

- new TT plugin for Borrowers, that at present supplies
  a method for determining if the patron is restricted
- setting the default value of SpecifyReturnDate to false
  during upgrade to avoid an unwelcome surprise
- validate the return date on the client side before
  allowing the form to be submitted.

Signed-off-by: Petter Goksoyr Asen <boutrosboutrosboutros@gmail.com>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>