[PATCH] gitk: Display commit messages with word wrap

Some people put very long strings into commit messages, which then
become invisible in gitk (word wrapping in the commit details window is
turned off, and there is no horizontal scroll bar).  Enabling word wrap
for just the commit message looks much better.

Wrapping is controlled by the "wrapcomment" option in ~/.gitk.  By
default this option is set to "none", which disables wrapping; setting
it to "word" enables word wrap for commit messages.

Signed-off-by: Sergey Vlasov <vsu@altlinux.ru>
Signed-off-by: Paul Mackerras <paulus@samba.org>