Display a watch cursor when reading the commits initially

Some speedups from not doing update so often

Fix bug in changing font size in entry widgets.
Fix bug with B1 click before anything has been drawn.
Use "units" and "pages" instead of "u" and "p" for tk8.5.

with a label.
Allow SHA1 ids or tags to be entered in the SHA1 ID field.

Add 'f' key for moving to next file

Put (deleted) or (created, mode xxx) in header lines
Fix scrolling to bring lines on screen

Make up/down/pgup/pgdn work again
Return in find string entry does find
Scale circles and lines with font size
Fix scrolling to make entire selected line visible
Use white circle for commits not listed but put in to terminate lines
Fix diff parsing for created and deleted files

Stop . bindings firing on find string entry keypresses
Fix geometry saving/restoring a bit
Show the terminal commits
Highlight comment matches in the comment window

to keep the proportionality of the pane widths as the overall
window is resized.

Added control+/- to increase/decrease font sizes
Rearranged code a little.

Add a find facility to search within the commits
Cope with multiple starting points.

Fix crash benh saw with currentid undefined
Add menu with file/quit and help/about items
Add ^Q for quit

Selecting in the listbox reduces the text view to just the
diff for the file(s) selected
Added -c option for color-by-committer
Added some more key bindings

Add some scrollbars

use a panedwindow for the main list with three panes,
and make them scroll together

Make it cope with commits having parents that aren't listed.