Disabling pipelining on multi handle with in-progress pipelined requests
leads to heap corruption and crash
changelog of the current development status, as one or more of these problems
may have been fixed since this was written!
+89. Disabling HTTP Pipelining when there are ongoing transfers can lead to
+ heap corruption and crash. http://curl.haxx.se/bug/view.cgi?id=1411
+
88. libcurl doesn't support CURLINFO_FILETIME for SFTP transfers and thus
curl's -R option also doesn't work then.