Preserving the state during data collection

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While collecting data based on an experiment plan, the status of the activity needs to be saved for keeping track of the plan execution. That is if data collected for session 1 form A is completed and then next day when experiment acquisition resumes, the user should be able to view that session 1 form A for subject A is completed and now should start with next acquisition form according to the plan.

[smpadhy]

related to #200