Fix up logging should dev turn it on
Log addition of sockets slightly earlier
Transcript makes a smidge more sense then
Promote timer firing up to be a regular CURLMultiLog
Perform cancellation work asynchronously so main thread can't block
Fix log statement
Log the number of bytes actually sent, as well as space available
Reword some log statements to be a little clearer
Bump some logging statments to be considered "detail"