LP#1728147: more tweaks to grid

LP#1728147: more tweaks to grid

* Make paths to expire_time and cut_in_line more concise
* Add SMS Carrier column back
* Tweak labels of the patron first and last name columns
* Ensure that the "Call Number" column continues to be sortable
  by normalized call number label. Note that due to a quirk of
  egGrid, which doesn't currently have a way to specify that a column
  always be retrieved by a fielder query but /not/ be directly
  available as a displayable column, we also need a "Call Number Label"
  column at the moment.

Signed-off-by: Galen Charlton <gmc@equinoxinitiative.org>