2014-08-10-14.42.31: src/c/hostthread/hostthread-on-posix-threads.c: Added pth__pthread_signal().  src/c/lib/hostthread/libmythryl-hostthread.c: Added signal_hostthread().   src/lib/std/src/hostthread.api:  Added signal_hostthread().  Point of this is to give io hostthreads a way to wake the threadkit hostthread up out of a pause() state without waiting for the next 50HZ SIGALRM.