Working project when downloaded from arXiv

Until now, we were assuming that the users would just clone the project in
Git. But after submitting arXiv:1909.11230, and trying to build directly
from the arXiv source, I noticed several problems that wouldn't allow users
to build it automatically. So I tried the build step by step and was able
to find a fix for the several issues that came up.

The scripting parts of the fix were primarily related to the fact that the
unpacked arXiv tarball isn't under version control, so some checks had to
be put there. Also, we wanted to make it easy to remove the extra files, so
an extra `--clean-texdit' option was added to `./project'.

Finally, some manual corrections were necessary (prior to running
`./project', which are now described in `README.md'. Most of the later
steps can be automated and we should do it later, I just don't have enough
time now.

1 files changed, 0 insertions, 0 deletions

diff --git a/.file-metadata b/.file-metadata
index 9c57cfd..dbc185c 100644
--- a/.file-metadata
+++ b/.file-metadata