- changed local library file includes from <> to ""
- get rid of 'if (is_serial)' conditions
- mbus_context_serial() and mbus_context_tcp() allocates memory and initialize context specific function pointers
- simply mbus_connect() called instead of mbus_connect_tcp() or mbus_connect_serial()
- context specific data can still be accessed via (void* auxdata) pointer
- strdup(3) to copy host IP into TCP context struct
