Utils.reconsile_thresholds - new method to convert from new threshold syntax to current one
Plugins module: PEP8 auto cleanup
Plugin Module - Manual pep8 cleanup
Plugins module: remove unused variable
Remove unneeded code
Plugins - new_threshold_syntax - support older syntax as a fallback
Plugins - new_threshold_syntax - minor cleanup
Plugins.PluginWrapper - code cleanup

* Command line arguments refactor to be a little more readable
* --legacy option is now deprecated as it is always on.
* convert_perfdata method now uses Utils.reconsile_thresholds internally
Unittests - Added tests for saving new objects