Merge branch 'speed_up_hdf5_sinogram_load' into 'master'

Speed up hdf5 sinogram load

See merge request !36
6 jobs for master in 14 minutes and 24 seconds (queued for 1 second)
Status Job ID Name Coverage
  Style
passed #198103
check_style

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  Build
passed #198104
linux
doc

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  Test Library
passed #198105
test:python3.7_stretch_pyqt5

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  Test Notbooks
passed #198106
test:test-tomoscan-tutorials

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  Deploy
passed #198107
linux
pages

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passed pages:deploy

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