Web client check-in "effective date" should also include times

[Galen Charlton]

This bug is splitting off part of bug 1552778, which is now concerned only with the checkout page. Quoting from Jane Sandberg's original bug report:

As an academic library that circulates certain materials for a few hours at a time, we would like to be able to backdate checkin to a certain time. However, the web client only allows an effective date in the form "yyyy-MM-dd" (we would prefer "yyyy-MM-dd HH:mm" for our local context). When I change the library setting "GUI: Format dates with this pattern" to "yyyy-MM-dd HH:mm", the checkin still only recognizes dates in the format "yyyy-MM-dd" as being valid times for backdating purposes.

Note: I don't believe that the ability to backdate to a specific time exists in the XUL client either.
Note: I tested this on the webby version of the web client

Evergreen master

[Galen Charlton (gmc)]

Noting that checkin_handle_backdate() in Open-ILS/src/perlmods/lib/OpenILS/Application/Circ/Circulate.pm will need to be updated to accept the time passed in, among other things.