bootserver: add script for listing nfs/nbd/smb clients
Bump the version number to 0.13.0
bootserver: new script for listing last successful Puavo user sessions
bootserver: add option to print last session times as relative
bootserver: align last user sessions times
bootserver: align output columns
Fix default mirror in usage information.
bootserver: add --network option to filter client queries
bootserver: add --interface option to filter client queries
bootserver: add iproute to dependencies
Update version
install: fix typo
install: make the wording of preseed options more user-friendly
bootserver: handle smoketest error when school does not have any roles
In puavo-make-install-disk do nothing if device type does not support
creating a preinstall disk.  Plus small changes and an explanation.
Merge branch 'master' into preinstaller

Conflicts:
	puavo-install/puavo-install