Add Event Sources:

- Add source property in Action and EventFilter
- Change TPropContainer contructor to accept keyword arguments and set
  properties that were given
- Change every single TPropContainer subclass constructor to accept
  kwargs and pass them on to super init
- Add a "null" option for TStringProperty
Use Event Sources:
- Make the probe require a source property to install or subscribe
- Have ProbeProxy install and subscribe return a prefixed address
- Make update, uninstall and unsubsribe extract the prefix from the
  address
- Have the TutorialRunner set a source on actions/events before
  installing/subscribing instead of setting current activity on
  ProbeManager
Test Event Sources:
- Change the tests according to the new constructors and behaviors

1 files changed, 5 insertions, 11 deletions

diff --git a/addons/readfile.py b/addons/readfile.py
index 4a6c54d..81385ba 100644
--- a/addons/readfile.py
+++ b/addons/readfile.py
@@ -21,19 +21,13 @@ from ..properties import TFileProperty
 from ..services import ObjectStore
 
 class ReadFile(Action):
+    """
+    Calls activity.read_file to restore a specified state to an activity
+    like when restored from the journal.
+    @param filename Path to the file to read
+    """
     filename = TFileProperty(None)
 
-    def __init__(self, filename=None):
-        """
-        Calls activity.read_file to restore a specified state to an activity
-        like when restored from the journal.
-        @param filename Path to the file to read
-        """
-        Action.__init__(self)
-
-        if filename:
-            self.filename=filename
-
     def do(self, **kwargs):
         """
         Perform the action, call read_file on the activity