Tag sidebar ordering modes

The following tag sidebar order modes could be added:

• Most used tags first
• Manual (custom) order

This assumes introducing some UI control that allows to toggle ordering mode.

Sorting tags by count was also suggested here:

http://cintanotes.com/forum/viewtopic.php?p=1017#p1017

Manual order allows me to arrange tags in the order I like by dragging them in the sidebar. This order is saved, and even if I switch to alphabetical order and then back to custom order, my custom order is preserved.

This feature would automatically cover this request: http://roadmap.cintanotes.com/topic/16170-pinning-favorite-tags-to-the-top-like-in-win7-taskbar/

Also, this feature is partially related to http://roadmap.cintanotes.com/topic/3225-show-tag-usage-counters-on-sidebar-in-tooltips/