Filterable fields are attempted to be autodetected by using the exportable fields.
Records can be filtered by fields with type select,select-cat,select-account,date,date-time (according to egw_record class)
only at this time. Filters are saved in the definition and used with scheduled exports. They are also available to the
user for modification in the export dialog.
export is quite clean at the moment, but import needs lots of work,
all the stuff is not really for production yet, but i import it now, so that the guy from metaways can also work on it.
most pending tasks:
- implement conversions based on regular expressions
- implement options of plugin
- rework import part (mostly ui)
