RS232-BMS bridge, tested, works treat. Fixed a few bmsnode bugs. Created PC side software

RS232-BMS bridge allows any PC to become a BMS master, for actual BMS master purposes, datalogging, testing, development, etc.

New bmsnode had a few small bugs, fixed those. All?(or most) features tested ok, need more testing

Created PC side software for message passing & parsing (a necessary development tool, also for end-users). The program
will eventually exist for factory-calibrating the nodes.