Attempt to de-clutter the icons in month and agenda view, and make them consistent.

Basically, the only icons shown now will be event/to-do/journal/holiday and readonly.
No longer show recurs and reminder icons in either view.

Let me know if you think this is a bad idea.
Perhaps not the best solution to toma's bug about the lock icon being too big, but its the best I can come up with right now.

Would also be nice if the tooltip showed more info.