BACKEND: Develop a backend analysis capabiilty for blood pressure

[gjwgit]

Extend the work undertaken in https://github.com/thanhnl2004/healthpod

This has added a new button top right in the blood pressure visualisation.

Currently it is just a demonstrator of end-to-end python scrip on the server doing an analysis and publishing results back to the pod.

This needs to be made operational

• Create a new POD called Analyser
• Individuals share Blood Pressure data with Analyser
• When a new POD has shared with Analyser run the python scripts
  • The python script reads all the blood pressure data, per POD
  • Calculate the averages per POD - and share each PODs average back to the POD
  • Calculate the average of the averages and share this with all PODs

[gjwgit]

Incorporate thanh's analysis into dev branch.