mod_base: added touch punch to enable drag/drop and other touch events on mobile touch devices. Fixes #597
code: Add z_datamodel:manage/4

Add 'force_update' option to datamodel to force overwriting the
database with the datamodel value, even though it has been changed in
the database.
mod_oembed: Better error reporting and "fix all" button
mod_oembed: Update NL translation