Draft: add skill_measures from Ulysses project

Features:

• adds the routines from the Skillas project to FORCES
• mo_moment:
  • added fypp version (now 1d, 2D, 3D)
  • removed all functions working on two arrays (correlation, covariance, mixed_central_moment, mixed_central_moment_var) to mo_errormeasures
  • implemented jams version from !67 with ddof argument
  • made procedure interface for average and mean
  • refactored many functions
  • had to rename arguments in moment to avoid name clashes with other routines
• mo_percentile:
  • added fypp version (now 1d, 2D, 3D, 4D)
  • added functions iqr, extremity (correlation, covariance, mixed_central_moment, mixed_central_moment_var) to mo_errormeasures
  • renamed main argument from x to dat to be consistent with other routines
  • renamed n argument in n_element to nn to be consistent with other routines
• mo_errormeasures:
  • added fypp version (now 1d, 2D, 3D)
  • added functions working on two arrays (correlation, covariance, mixed_central_moment, mixed_central_moment_var)
  • added options to kge to be able to use modified version also
  • added functions ets, crps, bsan, bsbn, bss, crpss, acc
  • refactored many functions

requested review from @muellese

assigned to @ottor

changed milestone to %v1.0

changed target branch from develop to main

added 124 commits

• d7764857...61c6a1b7 - 114 commits from branch chs:main
• bcf3da4f - added new files for errormeasures
• 13342ada - finalized fypp version of mo_errormeasures and refactored some calls to use core kge/nse routines
• 129bd4fa - added a function to infer dimensions in fypp
• c1464b29 - tested refactored mo_errormeasures
• 25b3c108 - added KGE from 2012 paper needed for skill metrics KGESS
• e0436754 - added further procedures from skillas to forces, fypp file still WIP
• 3769c669 - merged main into current branch
• 46851c11 - fixed mo_errormeasures, now need to move remaining skills to routine
• b208092f - refactored mo_moment as we need >1D average routines
• b7f0b548 - refactored all codes and successfully tested with nag

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changed title from Draft: WIP: add skill_measures from Ulysses project to Draft: add skill_measures from Ulysses project

changed the description

requested review from @thober and removed review request for @muellese

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• def0392f - changed kge call in kgess from kge09 to kge12

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• edd25e6a - added flag raiseError to enable silent nodata setting in critical errormeasures

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• 919e44f4 - fixed missing flag to correlation in kge

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• 99a75b92 - added modified bsan and bsbn,reference run threshold applied for forecasts...

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• 402c51bd - fixed crps test for length of timeseries from x to y arg

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• c6da9059 - added switch for zero variance in crps calculation

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• f7857c6b - fixed bug in crps calculation

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• 676ea30d - fixed bug in crps calculation, now also in non-fypp version

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• 331a50c1 - tried to improve speed of crps function

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• e0893ab9 - tried to improve speed of crps function, with non-fypp

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• need to add frpss here