Changelog since previous version

Config file format changes: section ispyb_mysql_sp renamed to ispyb_mariadb_sp (breaking change)
New reconnection parameters in config file (reconn_attempts and reconn_delay)
New methods for:
- storing x-ray centring results
- retrieving persons on a session
- un-assigning all containers on a certain beamline
update_container_assign now returns the containerId and the new containerStatus
Authorisation built into the queries for relevant stored procedures
Exceptions improved
Utilising the testdb fixture for most test
Removed:
- mxprocessing: upsert_program replaced with upsert_program_ex (breaking change)
- processing interface: removed get_processing_job (breaking change)

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