StrongDC++ sqlite r2086

• sqlite 3.6.16

Слияние из StrongDC++svn445
** svn445
small fix to avoid IP spoofing via INF
updated bandwidth limiter code (BCDC++)
better STA handling in DHT
** svn444
improved DHT firewall check
fixed memory leak
changed INF format for ping
added sources limit to search results
added node count check in search results
decreased republish time to 5 hours

** svn443
make option to set DHT/UDP port (still cannot be changed)
added IP:port check for DHT packets
partial file sharing in DHT
UDP buffer size respects settings
DHT uses UDP port 6240

** svn442
rewritten nodes expiration
decreased DHT search lifetimes
increased UDP receive buffer size
prepared for partial file sharing in DHT
forbidden duplicate DHT searches