TracBrowser: add two more key bindings:  - 'a' for going to the annotate page  - 'l' for going to the (change) log
TracBrowser: add two more key bindings:
 - 'a' for going to the annotate page
 - 'l' for going to the (change) log

Also fix keyboard navigation to the upper level.


git-svn-id: 0d96b0c1a6983ccc08b3732614f4d6bfcf9cbb42@7977 af82e41b-90c4-0310-8c96-b1721e28e2e2

rbaumg/trac,rbaumg/trac,rbaumg/trac,rbaumg/trac