added warn_if propertie to leaf value
added file and dir property to leaf value
config-model-edit: use YAML::Tiny instead of YAML::Any
config-model-edit: fix dump and dumptype options
config-model-edit: fix yaml and load_yaml options
config-model-edit: added system option to read a model from system files
rewrote dot diagram generator to use meta model only (was broken)
v1.241

    * config-model-edit:
      + added system option to read a model from system files
      * fix yaml and load_yaml options
      * fix dump and dumptype options
      * fixed dot diagram generator (i.e. -dot-diagram option)
    * dependency change: use YAML::Tiny instead of YAML::Any
    * leaf value model:
      + added file and dir and warn_if properties