__author__ = "Alfonso Tierno, Leonardo Mirabal"
__date__ = "$06-Feb-2017 12:07:15$"
-__version__ = "0.5.20-r536"
-version_date = "Sep 2017"
-database_version = 21 #needed database schema version
+__version__ = "0.5.21-r537"
+version_date = "Nov 2017"
+database_version = 22 #needed database schema version
HTTP_Bad_Request = 400
HTTP_Unauthorized = 401