Change ls -H back to the way it was yesterday, since this is

Change ls -H back to the way it was yesterday, since this is
compatible with FreeBSD and the POSIX spec is confusing
and somewhat contradictory.

(DEREF_COMMAND_LINE_ARGUMENTS): Change name back
from DEREF_COMMAND_LINE_SYMLINK_TO_DIR, updating all uses.
(long_options): Change the long option name back.
(usage): Change the usage back.
(gobble_file): When -H is specified, dereference a top-level
arg even if it points to a non-directory.