Bug 33948: Replace GetAllIssues with Koha::Checkouts - staff

Bug 33948: Replace GetAllIssues with Koha::Checkouts - staff

This patch replace GetAllIssues in readingrec.pl which is the only
occurrence in the staff code.

To test this patch you will need several items in your checkout history
in order to confirm that the display is the same before and after the
patch.

However there is one change! And it's a bug fix (or an enhancement, it
depends on how you see things). It includes checkouts with deleted items, which is
a long standing bug (see bug 8483).

Performance will be compared as well.

Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>