TracBrowser: improve keyboard navigation
- uses 'L' for log shortcut (so this leaves us 'l' available for another use, see #7867) - 'o'pen, 'v'iew, 'A'nnotate or 'reload' the entry under the mouse, if no current row has been selected yet with 'j' or 'k' - a few more code clean-ups
Authored by: cboos 2010-02-16
Parent: [r9194]
Child: [r9196]
