[core/config] Add interval (as parameter store)

Add a generic parameter store to the configuration and use it to set the
parameter "interval" (backwards compatibility)

tests/test_config.py

@@ -10,12 +10,24 @@ class config(unittest.TestCase):
     def tearDown(self):
         pass
 
-    def test_module_parameter(self):
+    def test_module(self):
         cfg = core.config.Config([ '-m' ] + self._someModules)
         self.assertEqual(self._someModules, cfg.modules())
 
-    def test_module_parameter_ordering_maintained(self):
+    def test_module_ordering_maintained(self):
         cfg = core.config.Config([ '-m' ] + self._someModules + [ '-m' ] + self._moreModules)
         self.assertEqual(self._someModules + self._moreModules, cfg.modules())
 
+    def test_default_interval(self):
+        cfg = core.config.Config([])
+        self.assertEqual(1, cfg.interval())
+
+    def test_interval(self):
+        cfg = core.config.Config([ '-p', 'interval=4'])
+        self.assertEqual(4, cfg.interval())
+
+    def test_float_interval(self):
+        cfg = core.config.Config([ '-p', 'interval=0.5'])
+        self.assertEqual(0.5, cfg.interval())
+
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