Bug 2806: Remove issuingbranch columns

Bug 2806: Remove issuingbranch columns

This column is not in used in the Koha code and could be removed.

Test plan:
Verify the branch is correctly displayed on the circulation history
(members/readingrec.pl) and that both reports Most-cisulated items
(cat_issues_top.pl) and Avg checkout (issues_avg_stats.pl) work as
before.

Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>
No problems found.
Fixed wrong table name on updatedatabase.pl and a tab char.

Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Passes tests and QA script.
Checked issues and returns are still working correctly.
There is no mention of issuingbranch in the codebase.

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