New way to read configuration tables:

(config_tables): New econfig key.
(read_config_tables): New, implements config_tables.
(main): Call it.  Need to call ef_init() and chdir(configdir) first.
(ef_init_srv): Don't call ef_init(), since main() did it already.

Remove old way to do the same:
(ef_load): Remove, along with calls.
(empfile): Set configuration tables' member file back to NULL.

src/lib/global/path.c.in

@@ -43,6 +43,9 @@ char dflt_econfig[] = "@econfig@";
 /* Where to find configuration, which is wherever econfig is looked for */
 char *configdir;
 
+/* User configuration tables to load, relative to configdir */
+char *config_tables = "";
+
 /* Where to find info pages */
 char *infodir	= "@einfodir@";