Fix test cases for the new EXPLAIN QUERY PLAN format. Add the

wherecosttest tool.  Other fixes to logarithm cost.

FossilOrigin-Name: aa580e368e3c398b8377b80342dfdd906324c248

test/misc7.test

@@ -269,17 +269,17 @@ ifcapable explain {
     CREATE TABLE abc(a PRIMARY KEY, b, c);
     EXPLAIN QUERY PLAN SELECT * FROM abc AS t2 WHERE rowid = 1;
   } {
-    0 0 0 {SEARCH TABLE abc AS t2 USING INTEGER PRIMARY KEY (rowid=?) (~1 rows)}
+    0 0 0 {SEARCH TABLE abc AS t2 USING INTEGER PRIMARY KEY (rowid=?)}
   }
   do_execsql_test misc7-14.2 {
     EXPLAIN QUERY PLAN SELECT * FROM abc AS t2 WHERE a = 1;
   } {0 0 0 
-     {SEARCH TABLE abc AS t2 USING INDEX sqlite_autoindex_abc_1 (a=?) (~1 rows)}
+     {SEARCH TABLE abc AS t2 USING INDEX sqlite_autoindex_abc_1 (a=?)}
   }
   do_execsql_test misc7-14.3 {
     EXPLAIN QUERY PLAN SELECT * FROM abc AS t2 ORDER BY a;
   } {0 0 0 
-     {SCAN TABLE abc AS t2 USING INDEX sqlite_autoindex_abc_1 (~1000000 rows)}
+     {SCAN TABLE abc AS t2 USING INDEX sqlite_autoindex_abc_1}
   }
 }