Patch for nanosecond scheduling precision in ns-3-click

Hello all,

After Sascha raised this issue on the ns-3-users list [1], I tried
making a quick patch to make Click's NS code use timespec, and make
the corresponding changes on the ns-3 side as well.

I've pushed the changes to my ns-3-click [2] and Click [3]
repositories. Kindly review. I'll push to ns-3-dev once the Click side
changes are applied. Note that this will probably break the ns-2
patches for nsclick.


[1] http://groups.google.com/group/ns-3-users/browse_thread/thread/2be8d60531bd82a8
[2] http://code.nsnam.org/lalith/ns-3-click-dev
[3] https://github.com/lalithsuresh/click

-- 
Lalith Suresh
www.lalith.in