gossip_cyclon: refactor cycle counting

git-svn-id: https://scalaris.googlecode.com/svn/trunk@6996 71766da9-9752-0410-ab17-bfafa751c56a
gossip_cyclon: cleanup type specs

git-svn-id: https://scalaris.googlecode.com/svn/trunk@6997 71766da9-9752-0410-ab17-bfafa751c56a
gossip_cyclon: performance tweak for startup

Avoids a 'discard_msg' in the select_data() of the first node, thereby
providing a faster startup of gossip_cyclon.

git-svn-id: https://scalaris.googlecode.com/svn/trunk@6998 71766da9-9752-0410-ab17-bfafa751c56a
gossip: add test group for all gossip tests

git-svn-id: https://scalaris.googlecode.com/svn/trunk@6999 71766da9-9752-0410-ab17-bfafa751c56a