REFAC: early work on alterative to std::map

2 jobs for new_md_ng in 4 minutes and 37 seconds (queued for 2 seconds)
latest
Status Job ID Name Coverage
  Precheck
failed #22134
fast-build

00:04:37

 
  External
failed cdash:ubuntu-18.04-fast

 
Name Stage Failure
failed
fast-build Precheck
   Drop site:https://cdash.orfeo-toolbox.org/submit.php?project=OTB
Uploaded: /builds/otb/build/Testing/20200228-1712/Build.xml
Uploaded: /builds/otb/build/Testing/20200228-1712/Configure.xml
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Running after script...
$ python3 -u CI/cdash_handler.py
CDash build URL : https://cdash.orfeo-toolbox.org/buildSummary.php?buildid=33088
ERROR: Job failed: exit code 1