Bug 7534: Add configuration to admin/branches.pl

Bug 7534: Add configuration to admin/branches.pl

This patch adds a configuration option for pickup locations.

To test:
1. Apply patch
2. Go to cgi-bin/koha/admin/branches.pl
3. Observe there is a new column "Pickup location"
4. Click "Edit" for any library
5. Scroll to bottom of the page and select "No"
6. Click "Submit"
7. Observe your library in Libraries-table, notice the value of "Pickup location"
   has changed to "No"

Signed-off-by: Koha Team AMU <axelle.clarisse@univ-amu.fr>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>