Revert "Replace ,o / ,O with better C-J / C-K"

This reverts commit 2e65b7120a760a410ef86d5cb181a6f9bb97d5bb.
Revert "Merge pull request #23 from sergueif/patch-2"

This reverts commit 0e82d9301d4d02665c1cd6ad098ef48758c3ef6d, reversing
changes made to b0c9d85e432aae92cdcc1bc5d494429f66f6f51d.