Nearest neighbor finder training module

Pull request #3: Users extended

Merge in EOSC-RS/nearest-neighbor-finder-training-module from users_extended to master

* commit 'ad9a81c971bed9fd8a4342f6e32690edadf7d2cd':
  added training of users  from pg actions: ordered, visited tables: users, users_aai, anon_users resources: 'datasets', 'publications', 'services',  'software',  'trainings', 'otherresearchproduct'
  minor fixes