FIX: add missing sqrt, save real std

Merged Vincent Eberle requested to merge fix_fits_std into NIFTy_8

Here the variance was saved, not the standard deviation Bugfix described in #358 (closed)

Fixes:

  • std is saved in last_std.fits
  • new test checking for equality of mean and std in fits and hdf5 files against the SampleList
Edited by Philipp Frank

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