First noordwijk implementation
Corrected some errors
Make virtual the SendData function

Subclasses can inherit and rewrite such function, to modify the sender's
behavior.
Bug fixes to noordwijk
ConnectionSucceeded of tcpSocket now virtual

Subclasses can know when the connection is succeeded.
Documentation and behavior fixed

Now it is the Noordwijk.
Added noordwijk as comparison of variants
Typos in tcp-variants-comparison.cc
Some fixes
Corrected doc and sources for TX_TIMER update

compute delta_i and update tx_timer in both rate adj and tracking
Fixed the timer
Dama First Version