Merge branch 'read_mvn_prior_from_file' into 'master'

Read and write a MultivariateGaussian prior to file

See merge request !515
6 jobs for master in 6 minutes and 20 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Test
passed #392770
basic-2.7

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passed #392771
basic-3.7

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passed #392772
python-2.7

00:05:32

passed #392773
python-3.7

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68.0%
 
  Deploy
passed #392774
pages

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failed pages:deploy

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