Implement frequency filters

filters.py

@@ -0,0 +1,13 @@
+from collections import namedtuple
+
+class Filters(object):
+    def __init__(self, *all_filters):
+        self.filter_widgets = all_filters
+
+    def activate(self):
+        for f in self.filter_widgets:
+            f.setEnabled(True)
+
+    def deactivate(self):
+        for f in self.filter_widgets:
+            f.setEnabled(False)