* Makefile (confdir/clients.conf): Tighten permissions to "u=rw". (install-server): Set mode of "/etc/mandos/clients.conf" to "u=rw". (install-client): Set mode of "/etc/mandos/plugins.d" to "u=rwx". (uninstall-client): Also remove "/usr/lib/mandos/plugins.d/usplash", "/usr/share/initramfs-tools/scripts/local-top/mandos", and "/etc/keys/mandos". (purge-server): Also remove "/var/run/mandos.pid".
* initramfs-tools-hook: Use "install" instead of "mkdir". Change owner of "/lib/mandos/plugins.d" and key files. Bug fix: do not repair permissions of "/lib/mandos/plugins.d". Bug fix: Really avoid deliberately unreadable files and/or directories.