Create a git repo with files checked in and a QC log. The purpose of this demo repo is for the user to become familiar with using review functions.
The files checked into the repo are at various stages in terms of their QC status. This function returns the path to the repo, so that the user can set their working directory to it.
This demo repo is created under the R session /tmp/ directory, so a new one
will need to be generated whenever the user restarts R.
demoRepo(clean = TRUE)
with_demoRepo(code, clean = TRUE)