fix: update works for archives, fromkeys doesn't clear archive


git-svn-id: svn+ssh://svn.mystic.cacr.caltech.edu/pathos/klepto@602 8bfda07e-5b16-0410-ab1d-fd04ec2748df
fix: _view failed for 2.6; added copy for archives


git-svn-id: svn+ssh://svn.mystic.cacr.caltech.edu/pathos/klepto@603 8bfda07e-5b16-0410-ab1d-fd04ec2748df
Merge branch 'master' of https://github.com/uqfoundation/klepto