Leapp framework release v0.6.0

• snactor
  • repo new subcommand: display message if directory with same name exists
  • discover subcommand: fix wrong path
  • workflow run subcommand: introduce --save-output parameter
  • fix cryptic message without user repo config
  • show global repos in repo list
  • fix trace on topic creation
• stdlib
  • make api directly available in stdlib
  • external program exec function - audit data generation and storage
• models
  • introduction of the JSON field type
• new debug and verbose modes
• new reporting capabilities
• change default loglevel to ERROR