Adding subscriber channel surfing experience.
This includes support to test multiple subscribers in parallel on multiple channels.
Various other changes to igmp, dhcp and Channels interface.
diff --git a/.gitignore b/.gitignore
index ba74660..cf55afb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -55,3 +55,9 @@
 
 # PyBuilder
 target/
+sub*.db
+*~
+*.swp
+*.jpeg
+*.gv
+*ascpc*@*#