Clear up the position re licencing of the two external sources of code in our refactoring

terminatorlib/borg.py

@@ -3,6 +3,9 @@
 # GPL v2 only
 """borg.py - We are the borg. Resistance is futile.
    http://code.activestate.com/recipes/66531/
+   ActiveState's policy appears to be that snippets
+   exist to encourage re-use, but I can not find any
+   specific licencing terms.
 
 >>> obj1 = TestBorg()
 >>> obj2 = TestBorg()

terminatorlib/plugin.py

@@ -2,6 +2,10 @@
 # Terminator by Chris Jones <cmsj@tenshu.net>
 # GPL v2 only
 """plugin.py - Base plugin system
+   Inspired by Armin Ronacher's post at
+   http://lucumr.pocoo.org/2006/7/3/python-plugin-system
+   Used with permission (the code in that post is to be
+   considered BSD licenced, per the authors wishes)
 
 >>> registry = PluginRegistry()
 >>> registry.instances