Extensions bitcoins/yacy added, new API functions for handling proxy/non-proxy added:

Extensions bitcoins/yacy added, new API functions for handling proxy/non-proxy added:
- New extension ext-bitcoins ( http://www.bitcoin.org) added as an alternative payment method to direct
  cash (Euro, US Dollar, ...)
- New extension ext-yacy ( http://yacy.net ) added to ease setup of a 'site
  search'. You still need a running YaCy instance somewhere (should be localhost
  for performance reasons).
- The API can now provide the real IP address (even from bethind a proxy) and
  'REMOTE_ADDR'. The real IP address can be "detected" with detectRealIpAddress()
  and 'REMOTE_ADDR' (which could be a proxy IP) with detectRemoteAddr().
- Wrapper function detectDomainName() introduced
- TODOs.txt updated