Add a field asset_flags and a corresponding enum to the asset database. This

CHANGES THE ASSET SERVER PROTOCOL and means you CAN NOT MIX PRIOR VERSIONS
WITH LATER ONES. It may also eat your babies, yada, yada, yada.
The usual cautions for migrations to the assets table apply.
Coding: Can not guarantee nut free.

OpenSim/Data/MySQL/Resources/007_AssetStore.sql

@@ -0,0 +1,5 @@
+BEGIN;
+
+ALTER TABLE assets ADD COLUMN asset_flags INTEGER NOT NULL DEFAULT 0;
+
+COMMIT;