Show feedback in detailview when sugar can't manage a entry - SL #328

The same criteria and message than in the ObjectPalette is used.

Fixes #328

Signed-off-by: Gonzalo Odiard <gonzalo@laptop.org>
Consolidate the control of what can be resumed in the journal

A function misc.can_resume() is added and replaced in the places
where is needed.

Signed-off-by: Gonzalo Odiard <gonzalo@laptop.org>