Bug 13029 : Follow up

Bug 13029 : Follow up

Adding POD, changing the config files to live in a path pointed to by
koha-conf.xml

This means multiple instances can have their own config

Please test the 2 patches together

Signed-off-by: Magnus Enger <magnus@libriotech.no>
Works as advertised. Arbitrary arguments can be passed to SMS:Send
drivers. If an argument is provided that has already been set by
SMS::Send or the driver, it will be overwritten by the value from
the YAML file. My only suggestion for an improvement would be an
example of what the YAML should look like, but that is a minor thing.

Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>