Add variadic style macro helpers that make debugging code disappear completely
(also the paramethers evaluation) when debugging level is lower
Chained style << is now atomic like variadic style, still can't benefit
of paramethers eveluation stripping
Reduced to minimum the difference between Android and other platform
debugging code
Port debugging code to new helpers, expecially a few corner cases to
test it, and as examples of how to use it.
