Portability to ULTRIX 4.4.  Fix "make distclean".

(domostlyclean): Remove libraries and installed include files.

Use NUL, not NULL, when talking about the character '\0'.

(LK_INSTALL_BUILT_HDRS): Arrange for the headers to be removed by
	"make mostlyclean".

	distribution.
(LIBS): Now only holds the libraries found by Autoconf.
(lyskomd, updateLysKOM, encrypt, dbck): Depend on, and link with, $(KOMLIBS).
(domostlyclean): Remove $(SPECIALS).

New calls: lookup_z_name, re_z_lookup, get_version_info.
Check for disk full errors in create_text.
Cleanup.

prot-A.txt updated.
Autoconf 2.1.

number, in logs.

	do disk succeeds, and return KOM_TEMPFAIL if it doesn't.

(async_i_am_off, async_broadcast): Removed.