Change version for wheezy
Revert bogus 'wheezy' branch back to a reasonable state

This branch was based off debian/krb5-1.10.1+dfsg-6, which never appeared
in wheezy.  Instead, a NMU by the security team appeared with that patch.
Attempt to reflect proper history by restoring the tree to that of
debian/krb5-1.10.1+dfsg-5, and including the corresponding commit as an
extra parent of this commit to show the correct ancestry.