Bug 13314: Follow-up for m.de.rooy in .mailmap

Email addresses in git seem to be case sensitive.
The list of shortlog -ns was good, but git shortlog -e still made a
difference.
Additionally, reworded initial comments slightly.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>
Bug 13242: Remove warning if no parameter given

Without any parameter, dt_from_string should not raise a warning
message.

Test plan:
Verify that the test file t/DateUtils.t displays a warning:

  Use of uninitialized value $date_string in pattern match (m//) at
  Koha/DateUtils.pm line 58

if the change in dt_from_string is not applied (manually edit the file).

Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>
Bug 9043: Add a wonderful image

This patch adds the missing multiple-select.png image.

Test plan:
- search the pref 'advsearch'
- without this patch, you get a 404 error for the image
- with this patch, you don't get the error but a wonderful image on the
  right of the "multiple" pref

Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>
Bug 13332: Fix conflict between 5304 and 10860

These 2 bugs are in conflict.
The first one always join the issue table, the second one join on this
table too if the OnSiteCheckouts pref is enable.
So DBI raises an error if the pref is enabled (2 joins on the same
table).

This patch removes the conditional join.

Test plan:
Go on a detail record page with items and verify that items are list and
that the error no more appears in the log file.

Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>
Reproduced the problem, the patch fixes it, no noticeable regression found.

Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Works as described, items are visible again.
Passes tests and QA script.

Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>