[Bug 1010] getaddrinfo() could block and thus should not be called by
the main thread/process.

#include <config.h> from all .c files and do not include it  from any .h files.

Previously config.h appeared a dozen times in preprocessed output of
some .c files.

handle relative path to logfile correctly despite
re-opening after fork() with a different curdir.

eliminate hand-crafted byte-swapping code from refclock_palisade.c in
preference to using htonl(), htons().  Tested by Fernando
Hauscarriaga.