Generic Browser - improve collapse/expand

Expand/collapse on click in the empty space.
Refresh state when content changes.
Utils Attachments - display files in one line
Generic Browser - allow width other than px or percent (like em)
Attachments - fix columns width

Date and title are static width now. Only text expands with browser window
Generic Browser - allow width other than px or percent (like em) fix
GenericBrowser improvements

Fix hiding of action column when no other action is available.
Move expand/collapse icon as last.
Shrink action's column size and expand it only if it's needed.