Remove pq2 remnants

etc/proof/utils/pq2/README.txt

etc/proof/utils/pq2/pq2-ana-dist

etc/proof/utils/pq2/pq2-cache

etc/proof/utils/pq2/pq2-info-server

etc/proof/utils/pq2/pq2-ls

etc/proof/utils/pq2/pq2-ls-files

etc/proof/utils/pq2/pq2-ls-files-server

etc/proof/utils/pq2/pq2-put

etc/proof/utils/pq2/pq2-redistribute

etc/proof/utils/pq2/pq2-rm

etc/proof/utils/pq2/pq2-verify

etc/proof/utils/pq2/setup-pq2