Add ghci config
Fix path

cabal needs to be in front of `/usr/local/bin` because otherwise, the
wrong version of cabal gets picked up. To simplify this, I'm moving all
of my path setup to one place.
Add the ability to pass options to mailrun

If we've passed a group on the command line, we should pass that to
mbsync. This allows me to consistently use `mailrun.sh` for all mail
fetching.
typo