Bug 16187: Add a script to cancel unfilled holds after a specified number of days

Bug 16187: Add a script to cancel unfilled holds after a specified number of days

This script takes parameters:
days - how many days waiting to concal an unfilled hold on or after
library - (repeatable) branches to consider
holidays - whether or not to count holidays (default is no)

This patchset adds two methods and covers them with tests:
Koha::Holds->unfilled(); To return holds where found = undef
Koha::Hold->age( $use_calendar ); To return the number of days since a
hold was placed (including or excluding holidays)

To test:
1 - Place some holds with varying reservedates
2 - Run script with different parameters to verify options are respected
(-v for verbosity will assist here)
3 - verify that script does nothing without days parameter

Sponsored by:
    Siskiyou County Library (http://www.siskiyoulibrary.info/)

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Bug 16187 - Followup

1 - Correct use of original (bad) script name
2 - Explain options better
3 - Remove change from 'W' to 'w'

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
RM note: Squashed for readability

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>