** TODO known issues
+- [ ] Update to use a recent exchangelib (e.g. ServiceAccount has been
+ done away with in favour of FaultTolerance)
+- [ ] Replace oauthclient2 use with google-auth-oauthlib (cf
+ https://google-auth.readthedocs.io/en/latest/oauth2client-deprecation.html
+ )
- [X] have option to re-make gcal event even if link exists when doing
matching (e.g. so if you've previously used a test gcal, it'll make
events in the new gcal)