added intersection to set's automake script

added intersection to set's automake script
renamed shared variable in set-service's common structure
reordered code in intersection
i assume: finished reworking intersection, still misses dynamic bloomfilter size
re-added struct SetState to intersection, which keeps track of the newest (and only this!) element count in the set's hashmap.
removed iterator over the set for counting (see line above)
a bugfix here and there