Add a generation counter to the Schema object and enhance OP_VerifySchema
to also check the Schema generation.  Fix for
ticket [f7b4edece25c99].

FossilOrigin-Name: 36c04dd1695f0899b53ce58738181b146fc005ed
diff --git a/src/vdbeblob.c b/src/vdbeblob.c
index f26cc87..18fdd46 100644
--- a/src/vdbeblob.c
+++ b/src/vdbeblob.c
@@ -266,6 +266,7 @@
       /* Configure the OP_VerifyCookie */
       sqlite3VdbeChangeP1(v, 1, iDb);
       sqlite3VdbeChangeP2(v, 1, pTab->pSchema->schema_cookie);
+      sqlite3VdbeChangeP3(v, 1, pTab->pSchema->iGeneration);
 
       /* Make sure a mutex is held on the table to be accessed */
       sqlite3VdbeUsesBtree(v, iDb);