Changes:
- FIX: Reduce logging of exception stack trace, if only standard HTTP warnings are logged like socket timeout
- ADD: allow to use configure file for most configurations
- ADD: Host throttler to try to reduce requesting same domain
- UPDATE: Upgrade db4o 7.11 to 7.12
- UPDATE: Upgrade HTTPClient 3 to 4
- UPDATE: Separate databases between queue and hashes.
- UPDATE: configure to use java...
