make disk cache pool allocator configurable
fix disk setting sync.
merged fix from RC_0_16
optimized rate limiter by allowing peers to request more bandwidth while waiting on the socket
merged implied_port from RC_0_16
merge fix from RC_0_16
back-ported choking issue at high uplod rates
merged python fix from RC_0_16
stop logging production asserts after 500 hits
make release asserts build
merged python fix from RC_0_16
merged encryption patch from RC_0_16
fix error handling when directories in the target are missing
fixed error handling of missing directories in download path
revert mistake
merge graceful pause fix from aio
merged piece request fix from RC_0_16
merge header fix from libtorrent_aio
remove resolve countries build configuration from the public API (make linking easier)
remove disable-dht build configuration from the public API (simplify linking)