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Flint: Fix memory leak

Valentin Valls requested to merge valentin.valls/bliss:fix-flint-memory-leak into master

This MR fixes the main memory leak in Flint.

  • Remove Qt parent from Flint Data object (so what python manage there life cycle)
  • Break ref cycle between object of the plot using weakref
  • Reimplement DeviceProxy method __repr__, and __str__ (which are buggy in PyTango) (see https://github.com/tango-controls/pytango/issues/298)
  • Add few helper to monitor the memory

Here is the result after 600 scans (in KB). There is maybe still something but it's much better than before. (tested with the monitoring enabled)

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