lb_active: changes to make progress in systems with large standard deviation

this reverts r6908

git-svn-id: https://scalaris.googlecode.com/svn/trunk@6911 71766da9-9752-0410-ab17-bfafa751c56a
dht_node_monitor: use config to adapt request counter resolution

git-svn-id: https://scalaris.googlecode.com/svn/trunk@6912 71766da9-9752-0410-ab17-bfafa751c56a
lb_stats: add different kind of weighted averages

git-svn-id: https://scalaris.googlecode.com/svn/trunk@6913 71766da9-9752-0410-ab17-bfafa751c56a
lb_active: remove unnecessary monitor reset messages

git-svn-id: https://scalaris.googlecode.com/svn/trunk@6914 71766da9-9752-0410-ab17-bfafa751c56a
lb_stats: collect a minimum and a maximum amount of metric data

git-svn-id: https://scalaris.googlecode.com/svn/trunk@6915 71766da9-9752-0410-ab17-bfafa751c56a
lb_active: exclude all db ops made during slides

git-svn-id: https://scalaris.googlecode.com/svn/trunk@6916 71766da9-9752-0410-ab17-bfafa751c56a
lb_active: count all kinds of requests, even to not found keys

git-svn-id: https://scalaris.googlecode.com/svn/trunk@6917 71766da9-9752-0410-ab17-bfafa751c56a
lb_active: if set in config, do not fall back to item balancing

git-svn-id: https://scalaris.googlecode.com/svn/trunk@6918 71766da9-9752-0410-ab17-bfafa751c56a
gossip: Refactor initialisation of callback modules to use proplists
gossip_load: Implement initialisation with proplists
gossip: move range calculation from dht_node_join to gossip

Move the calculation of the range (from the neighborhood) at startup from
dht_node_join to gossip.
gossip: Add neighbors to the init proplist of callback modules
gossip_cyclon: add initialization
gossip_cyclon: implement select_data
gossip_cyclon: implement get_node_details_response
gossip_cyclon: implement select_reply_data
gossip_cyclon: fix get_node_details_response
gossip_cyclon: implement integrate_data
gossip: refactor trigger handling

Refactor trigger handling to allow trigger_action messages for individual modules.
Needed for queing trigger_action messages for individual modules.
gossip: allow 'retry' in select_data() callback

Allow callback modules to queue select_data calls for retrial by returning
{retry, State} to the select_data() callback.