restore EAD/METS xml create functions; use templates from settings

I must have disabled this while I was refactoring and moving all
the metadata-level stuff from ddr to ddrlocal.

Uncommented the create() functions.
Get EAD, METS template paths from settings (the templates are
supposed to be copied into /etc/ddr/templates).
mkdir /etc/ddr/templates in updates.sh script