Update proof-of-concept code

* Add individual heatmaps
* Add dendograms
* Merge multiple heatmaps to single plot

  Updated the proof of concept code to provide a sample of what is needed to
  generate the appropriate heatmaps.

  To generate the sample heatmaps, one can run something like:

      env SQL_URI="mysql://webqtlout:webqtlout@127.0.0.1:3306/db_webqtl" \
      python3 qtlfilesexport.py

  assuming that the database can be accessed at 127.0.0.1:3306

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