Pipestat

Fixed
- Pipestat summarize html report columns now show stats only [148](https://github.com/pepkit/pipestat/issues/148).
- When creating HTML reports from both sample and project level results (multi results), only sample-level results show in the main index table [150](https://github.com/pepkit/pipestat/issues/150).
- Add more complex schema during dependency check to mitigate false test failures regarding different output schemas [181](https://github.com/pepkit/pipestat/issues/181).

Fixed
- Bug with rm_record for filebackend
- Bug when using record_identifier via env variable and the CLI
Added
- Added results history and history retrieval for both file and db backends via `retrieve_history` [177](https://github.com/pepkit/pipestat/issues/177).
- Added `remove_record` to Pipestat manager object (it is no longer only on backend classes)
- Added `meta` key to each record for the file backend
- db backend will now create an additional sql history table
- Reporting history is toggleable
Changed
- Removing the last result no longer removes the entire record.
- `pipestat_created_time, and `pipestat_modified_time` now live under the `meta` key.
- `history` lives under the `meta` key for the filebackend.

Changed
- Changed yacman requirement and using FutureYamlConfigManager.
Fixed
- Issue with retrieving similar record_identifiers, 159