Use class wrappers around the srmio library to insure that we always
close every opened device and free all allocated data. Includes other
little bits of stylistic cleanup.
The ghetto part is that we just read the device path out of the device name,
then pass that path directly to Rainer's srmpc_get_data, rather than passing
it an abstraction of a serial port. As such, this code will only work on
Unix-like operating systems. But it does work, and that's a good start.
