Bugfix 362 ctc sorting

[bikegeek]

• Describe testing already performed for these changes:
  
  Cloned repo on 'seneca' and using conda environment: /d1/personal/mwin/miniconda3/envs/mp_analysis_env
  ran all the unit tests for METcalcpy by running $METCALCPY_BASE/metcalcpy/test/run_all_nco.sh

(added nan and compound thresholds to the input data for the test_ctc_statistics.py)

• Recommend testing for the reviewer(s) to perform, including the location of input datasets, and any additional instructions:
  

perform the same as above. On 'seneca', the conda environment has permissions set to allow others in the same group to activate:

/d1/personal/mwin/miniconda3/envs/mp_analysis_env

• Do these changes include sufficient documentation updates, ensuring that no errors or warnings exist in the build of the documentation? [NA]

• Do these changes include sufficient testing updates? [Yes]

• Will this PR result in changes to the test suite? [No]
  
  If yes, describe the new output and/or changes to the existing output:
  

• Please complete this pull request review by [Fill in date].
  

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[hankenstein2]

Looks good