another undo patch: a feature request and implementation, should it be of interest

[Joel K. Pettersson]

On another note, a second feature addition for the index parameter
occurred to me, which became a very simple matter with the new code -
making a negative index do something, namely go forward from the
oldest revision.

While not as significant from a usability point as the previous
addition, perhaps the best point of it is a quick way of accessing the
oldest, for example diffing it with the newest, as in:

undo -dt-0 filename

This patch, unlike that of the previous addition, has documentation
updates, so should be a quick matter if of interest.

- Joel K. Pettersson
Attachment:
undo.patch
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