Rename Debothena to Chiron

Left untouched is the "Debothena Test" fetcher/matcher, because I like the font
and I don't remember what it was.
Fix bugtrackers.txt filename
Don't hardcode the project into the personal check

We used to detect personals by noting the presence of "chiron" in the
recipient, which made it hard to make additional chiron deployments. This
switches to using a non-empty recipient, avoiding that problem. Fixes
chiron-#19.
Allow subbing to classes in dev.py
Allow line breaks more places (chiron-#20)