When using sapling I often use `HEAD...origin/main` to diff the current
changes. This replicates this so you can diff a commit with other changes and
or merge commits in it.
When using nvim as a merge tool I had the files in the wrong order. It
was very confusing not having the local version in the middle and the
base and remote on ether side.
When running other log command the template I had setup in `sl` was not
getting used. This has now been put into the config so its the default
template for any log command.
This also adds a quick alias to switch to another head. When reviewing
pull requests locally this helps quickly switch between heads.
