Changes:
* Serialize JSON outcome field as a dictionary instead of string ([88](https://github.com/AI-SDC/ACRO/pull/88))
* Major code refactor of output storage ([89](https://github.com/AI-SDC/ACRO/pull/89))
* Add status, type and properties to the output metadata ([89](https://github.com/AI-SDC/ACRO/pull/89))
* Remove the timestamp from the output naming ([89](https://github.com/AI-SDC/ACRO/pull/89))
* Remove automatic reloading of existing results ([89](https://github.com/AI-SDC/ACRO/pull/89))
* Make custom file paths relatve instead of absolute ([89](https://github.com/AI-SDC/ACRO/pull/89))
* Split statsmodels outputs into multiple csv files ([89](https://github.com/AI-SDC/ACRO/pull/89))
* Change output field in JSON to a list of file paths ([89](https://github.com/AI-SDC/ACRO/pull/89))
* Finalise now takes two arguments: path and ext to specify a folder ([89](https://github.com/AI-SDC/ACRO/pull/89))
* Automatically copy custom outputs to the outputs folder upon finalise ([89](https://github.com/AI-SDC/ACRO/pull/89))
* Fix a bug attempting to write custom outputs in excel ([89](https://github.com/AI-SDC/ACRO/pull/89))
* ISO format timestamps ([89](https://github.com/AI-SDC/ACRO/pull/89))
* Store comments as a list of strings ([89](https://github.com/AI-SDC/ACRO/pull/89))