Loggerhead usage statistics

[Ian Clatworthy]

With some help from spm, poolie and I have been looking at how 
Loggerhead is actually used "in the wild" via Launchpad. Here's the 
breakdown of what pages are accessed and how often:

* the files and directory in the root - 29%
* a particular revision - 23%
* recent changes (mainline) - 17%
* the files and directories in a subdirectory - 17%
* annotate of a file - 12%
* other changes - 1%

We're yet to include some code paths, e.g. looking at a single file 
diff. We'll be doing that soon when we get some updated logs.

If you are using Loggerhead outside of Launchpad and believe your access 
statistics would look quite different, please let us know. (We're 
planning to use this information to drive performance tuning.)

Ian C.