[Ns-developers] Bug 557 patch review

[Faker Moatamri]

Dear all,
I post this patch for review. This patch actually refractors the code to 
do what is specified in bug 
557:http://www.nsnam.org/bugzilla/show_bug.cgi?id=557.
If we want to create an internet stack we can use the helper class 
internet-stack-helper to create the different components of the internet 
stack and to link them together. All the work done when aggregating a 
protocol with a node that used to make it a bit complex is now hidden 
using the Object::NotifyNewAggregate virtual function. This function is 
implemented by the different protocols (udp,tcp,ipv4,icmp...) to 
actually complete the aggregation between a given node and the protocol. 
It updates all the needed fields differently for each protocol so that 
the internet stack will be complete. It is called by the AggregateObject 
for all the protocols connected to the node.
I also cleaned up the code to make it more concise and removed some 
functions like AddInternetStack and some files like internet-stack.cc/h. 
The patch should apply very well to the current version of the 
repository (Thursday May 7th, 19:00 GMT+1).
If you need more precisions please don't hesitate to contact me. Any 
reviews and comments are welcome.
Best regards
Faker Moatamri
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