Bug 24846: Add new tool to batch extend due dates

Bug 24846: Add new tool to batch extend due dates

With events sometimes leading to unforeseen branch closures (think Coronavirus as
an example), it would be helpful to have a tool that would allow librarians to
update due dates in bulk based on branch and current due date of the material.

It allows to select checkouts given the following parameters:
 * libraries
 * patron's categories
 * range of the due date

You can set a hard due date, or define a number of days to extend the
due date.

Test plan:
Check some items out
Use the new tool to extend the due dates
Test the different filters to make sure they all work

Note: What about holidays?

Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>