Fixed bug when rows have non-constant height (drawing now positions itself absolutely relative to the page, should be pretty robust, though I admit it's hard to read).
Merge branch 'master' into jon
Merge remote-tracking branch 'jon/master' into jon
Expression editor is disabled unless the signal is in expression mode. Also took out some debugging helpers.
Remove delay for redrawing arrows (affects scrolling), doesn't seem to noticeably slow down operation (if update_display() is limited, redrawing arrows will only be called so often anyway).
  Added a few css rules to keep status bars from expanding.
Merged in master branch
Added a shift handler for selecting multiple rows
Merge branch 'master' into jon
Added a de-initialize function (this.remove() )
Merge remote-tracking branch 'jon/master' into jon
Renamed remove() as cleanup()
different styles for cells with signals of different lengths