ChangeLog, copy.c, gen_uuid.c, tst_uuid.c, uuid_time.c:

ChangeLog, copy.c, gen_uuid.c, tst_uuid.c, uuid_time.c:
  uuid_time.c (main), tst_uuid.c (main): Fix gcc -Wall complaints.
  copy.c (uuid_copy): Change arguments to make it clear which argument
  	is the source and which is the destination.
  gen_uuid.c (get_random_fd): Use gettimeofday to seed the PRNG, so we
  	can take advantage of tv_usec to do (slightly) better at seeding it.