fix: case where user role contains capital letters (and PostgreSQL doesn't like that)

SVN: 1180

dbmigration/source/java/ch/systemsx/cisd/dbmigration/DatabaseConfigurationContext.java

@@ -71,7 +71,7 @@ public class DatabaseConfigurationContext
 
     public DatabaseConfigurationContext()
     {
-        owner = System.getProperty("user.name");
+        owner = System.getProperty("user.name").toLowerCase();
     }
 
     /**