Correcting visual appearance of configuration dialog when some items (inputs/parameters/outputs) stretched across two or more lines.

- Corrected bug: when connection is removed during the process of input to parameter conversion - it was not reflected on the UI.
- Slight restyle: visibility of drop position is enhanced and move cursor is used now.

Widget configuration access link was added to the parameter dialog window (at the bottom).
User can configure his widget by:
- manually reordering inputs, outputs and parameters
- moving inputs to parameters and vice versa
Implementation required two new fields to be added in the database Input.order and Output.order

- "Save as new" button to all admin interfaces
- admin buttons also on the top of the page
- search button on top of admin lists (always searches by name)

Added ordering functionality also for sub-categories - similarly as abstract widgets are orderable inside category, also subcategories need to be orderable inside category.
Optimized/simplified admin.py a little by adding OrderableTabularInlineStyled

Signed-off-by: matjaz <matjaz@jursic.si>

popravil bug ce je workflow pobrisan in active workflow ostane (problemi pri exportanju in importanju fixturjev)