Dataset: JSON serialization

Implement JSON serialization of the Dataset object, instead of pickle so that it is easier to recover older datasets.

Data required to store & restore:

• variables:

  • name str
  • dimension int
  • dataobject class name str
  • domain - type & values Interval or Options --> serialize itself
  • units str
  • transformations (?) [str]
  • other settings?

• DP and PA blocks:

  • name and display name str
  • lists of variable names [str]

• data references:

  • list of UIDs, list of file names (suffixes), number of records per file --> already implemented as a dictionary