[Ns-commits] mathieu/ns-3-extra: add sample code for test, add doxygen doc

[code@nsnam-code.ece.gatech.edu]

user: Mathieu Lacage <mathieu.lacage at sophia.inria.fr>\nfiles: SConstruct samples/main-test.cc src/core/system-wall-clock-ms.h src/core/test.h\nurl: http://nsnam-code.ece.gatech.edu/mathieu/ns-3-extra?cmd=changeset;node=6672664e72bbd73a9506d1eccdefa99e1a561bc1\n