It's similar to ProjectVersionHeader, but dedicated to packages and
with the possibility of specifying the destination directory of the
generated header.

From: Marco Clemencic <marco.clemencic@cern.ch>


git-svn-id: svn+ssh://svn.cern.ch/reps/gaudi/Gaudi/trunk@6757 53ecefc3-a64d-0410-9bdf-b8581fa3287e