Small enhancements

Hi, I wanted a standard conform, well parsable logging format. JSON isn't possible with the current "logging engine", because we cannot simply add some additional lines to the end of the file for a valid json list, so I implemented the YAML format.


- Implemented logging to the well parsable YAML format
- Error Message is displayed if log file to open does not exist
- Fixed a bug with wrong inttype comparision in function setLogFileType(intype)
- Code enhancements