Add second binding for dired-up-directory
Rework command for opening default Org notes file

Almost every time I used `km/open-main-orgfile', I would jump to the
"Inbox" heading right after, so just have the command do that for me.
Update magit-log-all-branches for upstream changes

Magit commit 893e2fea941335f1f428c2e1f996e42822b0fe59
Go back to default initial major mode

Switched to Org in 71642c8257e367d82631cbb740b1325fe44df50f.