Surface owner storage capabilities and storage rates

Allow showing all significant digits of currency value

Improve currency rounding

Compute rates from 0 GB

Match usage_rates from plans

Refactor usage rate rending

Test domain capabilities returned via API
Fix up rates incorrectly rounded to bash.00
Add better defaults and documentation
Merge pull request #4851 from ironcladlou/logshifter/reorg

Merged by openshift-bot
Merge pull request #4684 from liggitt/domain_capabilities

Merged by openshift-bot
Update README.md