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 Name Job ID Coverage
  Style
passed check_style #156623

00:00:23

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

00:02:00

passed test:python3.7_stretch_pyqt5 #156625

00:01:55

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

00:01:18