removed already deprecated prepare_debian_package.cmake, which has just been added and will unnecessarily cause conflicts in the anyway deprecated way to create debian packages

added prepare_debian_package.cmake (currently just a copy of the version in the DOOCSwrappers library)

Warning: this commit will create conflicts, but it is anyway needed to adapt the projects using this templates due to the last commits.

git-svn-id: https://svnsrv.desy.de/desy/mtca4u/InstaCoSADev/trunk@2635 5f601a5c-88b9-47f3-b851-818f6741d00d