Revert "Merge branch 'h5py_3_compatibility' into 'master'"

This reverts merge request !28
4 jobs for revert-b44a4210 in 3 minutes and 42 seconds (queued for 1 second)
Status Job ID Name Coverage
  Style
passed #156623
check_style

00:00:23

 
  Test Library
passed #156624
test:python3.5-stretch-pyqt5

00:02:00

passed #156625
test:python3.7_stretch_pyqt5

00:01:55

 
  Test Notbooks
passed #156626
test:test-tomoscan-tutorials

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