[security] use a stronger encryption algorythm for password, keeping bw compat
Administrator should ask their users to reenter new password so they
benefit from the new encryption.
Also, new encryption is cross-platform compatible, eg you may now move an instance
from windows to linux painlessly
debian/tmp/usr/lib/PY_VERSION/site-packages/cubicweb/web usr/lib/PY_VERSION/site-packages/cubicweb
debian/tmp/usr/share/cubicweb/cubes/shared/data usr/share/cubicweb/cubes/shared
debian/tmp/usr/share/cubicweb/cubes/shared/wdoc usr/share/cubicweb/cubes/shared