Pacifica-archiveinterface

Changed
- Pull 111 Packaging Improvements Pip>=20 by [dmlb2000](https://github.com/dmlb2000)

Changed
- Pull 105 Pacifica Namespace fixes by [dmlb2000](https://github.com/dmlb2000)
- Fix 102 HPSS Latency is an integer by [dmlb2000](https://github.com/dmlb2000)
- Pull 106 Add Seek and Byte Range Options by [dmlb2000](https://github.com/dmlb2000)
- Fix 95 Add id2filename documentation by [dmlb2000](https://github.com/dmlb2000)

Changed
- Pull 100 Add Python 3.7 and 3.8 testing by [dmlb2000](https://github.com/dmlb2000)
- Fix 96 add HPSS Latency configuration by [karcaw](https://github.com/karcaw)
- Pull 98 Use Pylint 2.0+ by [dmlb2000](https://github.com/dmlb2000)
- Pull 97 Remove Python 2.7 support by [dmlb2000](https://github.com/dmlb2000)

Changed
- Fix 87 and 88 More post deployment testing features by [dmlb2000](https://github.com/dmlb2000)
- Fix 83 and 84 Update HPSS extentions for Python 3 by [karcaw](https://github.com/karcaw)
- Update Pipeline to test post deployment more by [dmlb2000](https://github.com/dmlb2000)

Added
- POSIX Backend Support
- ReadtheDocs supported Sphinx docs
- Backend Plugin API
- Post Install Testing
- REST API for sending and recieving data.
- PUT - Send data to a file.
- GET - Get data from a file.
- POST - Stage a file from tape.
- HEAD - Get file status.
- PATCH - Move a file into place.

Changed