Bug 7213 - simple /svc/ HTTP example

Bug 7213 - simple /svc/ HTTP example

Simple command-line client which can authorize itself to Koha,
get MARC XML record based on biblio number and update record

This script can also be used as module using require "koha-svc.pl"
from other scripts which can implement MARC XML creation or parsing.

This is follow up version which now uses Content-type: text/xml
header when using POST method to be in sync with documentation at
http://wiki.koha-community.org/wiki/Koha_/svc/_HTTP_API

Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>