bbd.pod: added directive "linked"
.check_ortsschilder2: check using new directive "linked"
data update (ortsschilder: make use of new directive "linked")
data update (ortsschilder: more "linked" directives)
.check_ortsschilder_dist: now also is using "linked" directive
data update (minor survey)
data update (temp blockings with permanent=>1 entries)