Fixes#972
This required regenerating the protobufs generated files, which seem to
have tons of extra changes, and needed some manual changes to get them
to compile.
Overall, the entire protobuf idea wasn't the best in retrospect, and in
the next version of GitJournal, I'll be going with a simple relational
database instead.
Any files with external contributions need to be Apache2 licensed, since
I don't have any CLA, and need to release this on the ios store where
*GPL apps are a problem.
This allows switching the precision of Unix timestamps in YAML
frontmatter between second (the current beahaviour) and millisecond
(compatible with Dendron) precision.
