[COGITO PATCH] Fix cg-log and cg-status for non-GNU sed/sort

Here're a couple of pretty simple patches against cg-log and cg-status (two cogito
commands I use a lot) for the non-GNU (or at least older, forked GNU) tools on Darwin.

There's also a non-GNU sed problem in cg-commit, but I haven't quite figured a good way
to tackle this issue yet. (The problem is in the regex stripping leading and trailing
newlines from $LOGMSG at line 170. Darwin's sed does not like the embedded curly braces,
but there's not a good simple way to rewrite this and retain the meaning of the "sedlet"
that tracks whether its seen any text yet.)

Cheers,

--Mark