This release:
- Restructures the serial logging code, hopefully resolving the data replication and / or loss reported in #210 and #208, possibly #201 too
- Allows all log files to be deleted via "RM *" or "DEL *" in the SD menu
- !!! Please note !!! "DEL *" will delete ALL files on the SD card - except the two OLA_settings files. Use with appropriate caution!!