Allow to use other field with the binary widget

review2921002
Fix find button in search window

It should use the text filled in the search entry.
And it should not close the window if nothing is found.

review3101003
Send record-saved signal after display

When called before display, current_view could still have unformatted value on
the widgets which could be considered as different.

review3131003
Use same modified value as on_change for pre_validate

The value sent for pre_validation will be used to instanciate a record in the
same way as on_change. It is also better to get the id also for pre_validate.

review3211002
Remove process call on wizard sensitive state change

This hack was added by changeset cd8bf16ecab4 to manage wizard launching other
wizards but changeset 8bcd8092c2d9 makes this hack useless.

issue3638
review3201003