All curl_multi_setopt options listed

All existing options for curl_multi_setopt in alphabetical order.

CURLMOPT_CHUNK_LENGTH_PENALTY_SIZE chunk length threshold for pipelining
CURLMOPT_CONTENT_LENGTH_PENALTY_SIZE size threshold for pipelining penalty
CURLMOPT_MAXCONNECTS set size of connection cache
CURLMOPT_MAX_HOST_CONNECTIONS set max number of connections to a single host
CURLMOPT_MAX_PIPELINE_LENGTH maximum number of requests in a pipeline
CURLMOPT_MAX_TOTAL_CONNECTIONS max simultaneously open connections
CURLMOPT_PIPELINING enable HTTP pipelining and multiplexing
CURLMOPT_PIPELINING_SERVER_BL pipelining server blacklist
CURLMOPT_PIPELINING_SITE_BL pipelining host blacklist
CURLMOPT_PUSHDATA pointer to pass to push callback
CURLMOPT_PUSHFUNCTION callback that approves or denies server pushes
CURLMOPT_SOCKETDATA custom pointer passed to the socket callback
CURLMOPT_SOCKETFUNCTION callback informed about what to wait for
CURLMOPT_TIMERDATA custom pointer to pass to timer callback
CURLMOPT_TIMERFUNCTION set callback to receive timeout values