fix pre 2.0 sqlalchemy usage, and import medashare for orm..

ui/medashare/alembic/script.py.mako

@@ -7,6 +7,7 @@ Create Date: ${create_date}
 """
 from alembic import op
 import sqlalchemy as sa
+import medashare
 from medashare import mdb
 ${imports if imports else ""}
 
@@ -25,7 +26,7 @@ def upgrade() -> None:
     mdo = sa.schema.MetaData()
     #mdotbl = sa.Table('metadata_objects', mdo, autoload_with=connection.engine)
 
-    #stmt = sa.select([mdotbl.c.uuid, mdotbl.c.data])
+    #stmt = sa.select(mdotbl.c.uuid, mdotbl.c.data)
     #newtypes = [ dict(olduuid=uuid, newtype=mdb.MDBase.decode(data).type) for
     #    uuid, data in connection.execute(stmt) ]