initial changes:
- menu on top: minimize to the left so it doesn't eat space
- hidden graphiti title on top and footer
- hide edit/delete button beneath graphs in dashboard&graph view
- resize graphs to the max, number of graphs per line can be given in url argument e.g. #n=4
- number of graphs settable via menu top left
- "show last..." (30m, 1h,...) prepared, doesn't work yet. Should synchronize timing within all graphs