* Clean up time series models
* Add value group rollup class for summarizing hierarchical data
* Integrate new classes
* Update UI to use new patterns
* Update D3 charts to expect new data format
* Clean up account model
* More cleanup
* Money improvements
* Use new money fields
* Remove invalid fixture data to avoid orphaned accountables
* Update time series to work better with collections
* Fix tests and UI bugs
* Update hard-coded currency UI with currency specific params
* Rename extension methods to match currency option names; Move cents extension to numeric class extension
* Use currency's precision to show the cents part in accounts show page
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Co-authored-by: Sriram Krishnan <sriram@seafoodsouq.com>
