Don't send async-sub-recipient messages when texts are deleted.

ChangeLog

 1999-05-30  Per Cederqvist  <ceder@gratia>
 
+	Don't send async-sub-recipient messages when texts are deleted.
+	* src/server/text.c (perform_subtraction): New static function,
+	extracted from do_sub_recpt.  Only send async-sub-recipient if
+	the new argument want_async is true.
+	(do_sub_recpt): Code simplified by creation of
+	perform_subtraction().  New argument: want_async (see above).
+	(do_delete_text): Tell do_sub_recpt that we don't want any
+	async-sub-recipient messages.
+	(sub_recipient): Tell do_sub_recpt to send async-sub-recipient
+	messages.
+	* src/server/testsuite/lyskomd.0/09.exp: async-sub-recipient
+ 	messages are no longer erroneously sent.  Comment out the code
+	that causes a core dump.
+	* src/server/testsuite/lyskomd.0/send-async-cov.exp: Likewise.
+	* src/server/testsuite/lyskomd.0/06.exp: async-sub-recipient
+ 	messages are no longer erroneously sent.
+
 	Added a test case that corresponds to the bug found 1999-05-24.
 	* src/server/testsuite/lyskomd.0/09.exp: This test now causes
 	lyskomd to dump core while garbing texts.