Add --force parameter to qvd-admin.pl. Closes #1201.

git-svn-id: https://svn.qindel.com/repos/main/projects/qindel/QVD/src/trunk@17823 4046b530-fbad-4e16-af16-ee11f0b55167
Improve r17823 by mentioning the --force parameter in the help messages.

git-svn-id: https://svn.qindel.com/repos/main/projects/qindel/QVD/src/trunk@17835 4046b530-fbad-4e16-af16-ee11f0b55167