Since I seem to be bug compatible with the head I'm going to commit.

Since I seem to be bug compatible with the head I'm going to commit.
There is still one documentation warning in the stat code, probably a
doxygen error.

base/statistics.cc:
    Added documentation to SubData and StatData.
base/statistics.hh:
    Documented most of the basic stats (storage, implemenation) and all of the
    visible stats. There is more to be documented, but I'm going crazy now.

    Also fixed the DistStor::zero() function to meet the semantics of the other ones.

--HG--
extra : convert_revision : f80b3075a3298cbded059be8125b7fc7b77020a9