Added main.py that now contains the One & Only Singleton instance of these classes:

- Navigator
 - Aplication
 - Workflow
 - Project
 - Options
Corresponding changes have been added in lots of other files to account for this, but
the access to these objects should now be a lot easier.

workflows/smokers.py

@@ -13,8 +13,8 @@ class SmallTestWorkflow(workflow.Workflow):
     ident = 'smokers'
     description = 'A small test workflow for gene expression analysis.'
 
-    def __init__(self, app):
-        workflow.Workflow.__init__(self, app)        
+    def __init__(self):
+        workflow.Workflow.__init__(self)        
 
         # DATA IMPORT
         load = workflow.Stage('load', 'Data')