Egcg-core

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- Adding LoggingConfiguration.reset
- Removing PBSExecutor
- Removing implicit parameters on cluster jobs, esp. cpu=1 and mem=2
- Allowing Executor to call start() in the same way as other executors
- Process-safe check logging in integration_testing
- Catching all exceptions in Communicator.\_\_del\_\_
- Stricter versions in requirements.txt

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- Adding `-` and `.` to replaceable characters in `clarity.sanitise_user_id`
- Making Session objects unique to child processes in `rest_communication`

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- Breaking change: removed `clarity.get_expected_yield_for_sample`
- Catching notification failures
- Added retries and multiprocessing lock to `rest_communication`
- Added log warnings to `util.find_file`
- Added `integration_testing` library and runner

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- New constant to record number of Phix reads

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- New constants capturing the Interop metrics
- New function for querying dict with dot notation

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- New EmailSender class that take most of the feature of EmailNotification