up to 0.8.8b

- bug: Fixed issue with custom data source information being lost when saved from edit
- bug: Repopulate the poller cache on new installations
- bug: Fix issue with poller not escaping the script query path correctly
- bug: Allow snmpv3 priv proto none
- bug: Fix issue where host activate may flush the entire poller item cache
- security: SQL injection and shell escaping issues