Remove a few performance problems and some dead code.

ChangeLog

+1999-07-06  Per Cederqvist  <ceder@gratia>
+
+	Remove a few performance problems.
+	* src/server/membership.c (access_perm_helper): New argument:
+ 	wanted_access.  All callers updated.  Avoid calling is_supervisor
+ 	or is_member if not needed.
+	(get_unread_confs): Minor performance improvement: there is no
+ 	need to call access_perm if pers_no is the logged-in person.
+	* src/server/simple-cache.c (copy_file): Use a static buffer
+	instead of allocating and releasing a buffer each time this
+	function is called.
+
+	Remove dead code.
+	* src/server/manipulate.h (IMPL): Unused macro removed.
+	* src/server/dbck-cache.c (IMPL): Unused macro removed.
+	* src/server/ram-parse.c (fparse_conference_2): Remove dead code
+ 	that depends on the long-obsolete DISKERR symbol.
+	(fparse_conference_0): Likewise.
+	(fparse_person_0): Likewise.
+	(fparse_person_2): Likewise.
+	(fparse_text_stat_2): Likewise.
+	(fparse_text_stat_0): Likewise.
+
 1999-07-05  Per Cederqvist  <ceder@gratia>
 
 	Speed up access_perm, is_supervisor and is_strictly_supervisor by