- adds date field to log file (requires exact time to be sent by heating system)
- /D0 recreates datalog.txt file with table header
- added "flags" field to command table structure. Currently, only FL_RONLY is supported to make a parameter read-only
- added DEFAULT_FLAG in config. Defaults to NULL, i.e. all fields are read/writeable.
- Setting it to FL_RONLY makes all parameters read-only, e.g. for added level of security.
- Individual parameters can be set to NULL/FL_RONLY to make only these parameters writable/read-only.