[BUG #5426] being too smart during check doesn't pay off (remove macro expansion and jobname check)
[BUG #5426] schema diet (side-effect: schema is now bare/processing agnostic)
fix tiny issues in schema of Manifest.json
[BUG #5426] schema validaton reorganization: created two dedicated jobs 'validate-manifest' and 'validate-config'
[BUG #5426] add 'validate-*' jobs in config.json files
[BUG #5426] add 'validate-*' jobs in config.json files of skeletons