Temporarily revert Tobi's commits

Temporarily revert Tobi's commits

Rewind to Giuseppe's last version temporarily. I'll then cherry-pick
my commits (that have been uploaded), tag then re-apply Tobi's.

This reverts commit 2e11b1863ef81829eecca4b29e5b1a9565c7d0b3.
    " Fixed postinst script: Version is only valid when configuring."
This reverts commit 0babd5f3ca0ce0f4aad44e1f8ef803eafca215b2.
    "Remove '/var/lib/smartmontools' on purge (Closes: #766145)"
This reverts commit 0b361a554f367f2058b9c8b70d5c8a62fa448ad3.
    "Import patch from Helmut, #794035"
This reverts commit cf6a11185d0a8213297d692b3ee49e95ebd81291.
    "Import d/changelog from last uploaded version (6.3+svn4002-2)"