Bug 12031: [QA Follow-up] Undefined routine and change to koha-conf.xml

Bug 12031: [QA Follow-up] Undefined routine and change to koha-conf.xml

[1] Routine add_cron_job was added in 2007 but has not been defined.
    Parameter Recurring is not used.
[2] Made some changes to koha-conf.xml. Instead of an example to edit,
    I replaced it by the SCRIPT_NONDEV_DIR install variable.
[3] SCRIPT_NONDEV_DIR had to be included in rewrite-config.pl and the
    path had to be corrected for dev installs in Makefile.PL

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Tested single and dev install for supportdir change.
Compared installations with and without the patches for this report.

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