add constants package

python/devsup/__init__.py

@@ -3,6 +3,11 @@ try:
 except ImportError:
     import devsup._nullapi as _dbapi
 
+try:
+    from _dbconstants import *
+except ImportError:
+    pass
+
 __all__ = ['verinfo']
 
 verinfo = _dbapi.verinfo