Don't let Diffusion show that an importing repository is "100%" imported
Summary:
A few users have hit this and found it confusing. Currently, it means "more than 99.95%", which is very different from "100%". Instead:
- show an extra digit of precision; and
- cap the display at "99.99%", so it's more clear that work is still happening.
Test Plan: Faked it and saw it cap at 99.99%.
Reviewers: btrahan
Reviewed By: btrahan
CC: aran
Differential Revision: https://secure.phabricator.com/D8058