fix: use newer archistar-bft and archistar-smc versions
chg: make thread-group configurable and switch to 16 threads

This should improve the performance of the integrated ArchistarS3
test-case. Still remember to start it with a high nice value as it
seems (to me) that java somehow gets thread priorities messed up.
Merge pull request #18 from andreashappe/master

performance improvements and (implicit) stability fixes