Add new button to update a bookmarked search.
Hide buttons when not needed.
Reset form when selecting 'New bookmark'.

Signed-off-by: Hugues Peccatte <hugues.peccatte@gmail.com>
Remove hint about bookmarked searches.

Signed-off-by: Hugues Peccatte <hugues.peccatte@gmail.com>
Merge pull request #1041 from Tithugues/improveBookmarkedSearches

Improve bookmarked searches