* 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.
- Remove shared/str.h where not used.
- Remove shared/debug.h from all files as it has been completely replaced
by shared/report.h (it will be removed later).
- Add more doxygen comments to shared/* and clients/lcdproc/*.
- Include static functions in doxygen output.
mmdolze