Storage_Ent_Transfer

Make all 8 current "to|from_spare#" fields string1000 instead of string80, so complete changes to spare# fields can be tracked.

Add "to_spare_int1" through "to_spare_int4" and "from_spare_int1" through "from_spare_int4" (all int32, nullable) to allow changes to "spare_int#" fields in storage_exec to be tracked.

Add cascade-delete (implemented by SP) foreign keys from to_storage_ent_id and from_storage_ent_id to ent.