In TBranch CopyAddress (and hence indirectly in the fast cloning)

avoid having to read the first entry just to get the address set
and do the address setting directly.

In FlushOneBasket, do no delete the basket and buffer just because
it has already been flushed (it just so happen to be exactly full
at the same entry as the flushing is done).


git-svn-id: http://root.cern.ch/svn/root/trunk@37168 27541ba8-7e3a-0410-8455-c3a389f83636