* Do not include system headers in shared files (stdlib.h).
* Don't include lcd.h only once in each driver.
* Remove some unnecessary headers from driver (e.g. syslog.h)
* Include <poll.h> instead of <sys/poll.h>
* Spelling fixes.
a sequence of characters or commands have to be terminated (common_init,
position, flush). Modify the lcd2usb subdriver to implement a small command
buffer and implement flush().
mmdolze