Auto-start and keep-alive DICOM Store SCP

[Ed McDonagh]

Should be possible to configure DICOM Store SCPs to auto start when Celery/Celery beat is started, and to restart if it fails.

[Ed McDonagh]

Added keep-alive function as basis for maintaining DICOM Store SCP nodes; created schedule for it and got it running successfully. Refs #292

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[Ed McDonagh]

Starting to build echoscu based on qrscu. Refs #292

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[Ed McDonagh]

First draft of a working echo_scu tool. Returns 'AssocFail' if no association, and Success if echo works. Haven't engineered a successful association but rejected echo yet. Refs #292

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[Ed McDonagh]

Tidied up, added preliminary code docs. Refs #292

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[Ed McDonagh]

Added field to StoreSCP model for keep_alive flag, and added it to the migration file. Refs #292 and #290

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[Ed McDonagh]

Rudimentary, but working, auto-start and restart function for Store SCP nodes based on failure to associate only at the moment. Refs #292

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[Ed McDonagh]

Putting keep_alive import back into the tasks file - it is required. Refs #292

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[Ed McDonagh]

Adjusting all the echoscu logging message levels and text. Refs #292

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[Ed McDonagh]

More logging level and text modifications. Refs #292

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[Ed McDonagh]

Created AJAX status update for store node. Works, but found that if keep_alive has sent lots of start tasks that haven't been actioned, it can be impossible to kill the store node! Refs #292

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[Ed McDonagh]

Rolled status update into last known status cell in table. Works. Refs #292

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[Ed McDonagh]

Now disables the delete button when the store is live, and disables the stop and start buttons as necessary too. Floats stop/start to right. Refs #292

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[Ed McDonagh]

Added rudimentary DICOM status to the QR page. Refs #292

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[Ed McDonagh]

Added a rudimentary section on celery beat to the start services section. Refs #292

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[Ed McDonagh]

Functionality now exists to auto-start and keep alive Store SCPs. Also shows Store status, and Store and QR status on the QR page. Fixes #292

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[Ed McDonagh]

Corrected hard-coded Move AE Title. Added Try Except for logging station name so it doesn't quit when the station name is missing. Refs #292

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