Added an assert() to detect lookaside memory leaks.  Also added the
SQLITE_OMIT_LOOKASIDE compile-time option which is useful in trying to
track down lookaside memory leaks. (CVS 5800)

FossilOrigin-Name: 0c4c66071a46cecc5f87afb8f8f01ae2c90ee9b3
diff --git a/src/main.c b/src/main.c
index 97d5475..1e6d2d5 100644
--- a/src/main.c
+++ b/src/main.c
@@ -14,7 +14,7 @@
 ** other files are for internal use by SQLite and should not be
 ** accessed by users of the library.
 **
-** $Id: main.c,v 1.506 2008/10/11 15:20:05 drh Exp $
+** $Id: main.c,v 1.507 2008/10/11 15:38:30 drh Exp $
 */
 #include "sqliteInt.h"
 #include <ctype.h>
@@ -635,6 +635,7 @@
   sqlite3_mutex_leave(db->mutex);
   db->magic = SQLITE_MAGIC_CLOSED;
   sqlite3_mutex_free(db->mutex);
+  assert( db->lookaside.nOut==0 );  /* Fails on a lookaside memory leak */
   if( db->lookaside.bMalloced ){
     sqlite3_free(db->lookaside.pStart);
   }