Cleanups, that do seem to have boosted SFTP download performance up to 300% in

some tests:

  * cut off "_ex" from several internal function names

  * corrected some log outputs

  * simplified libssh2_channel_read_ex() and made it much faster in the process

  * cut out {{{ and }}} comments that were incorrect anyway

  * fixed sftp_packet_ask() to return the correct packet by using memcmp() and
    not strncmp()

  * fixed mkdir()'s wait for packet to use the correct request_id - it
    semi-worked previously because strncmp() in sftp_packet_ask() made it
    match far too easily.

  * took away the polling functionality from sftp_packet_ask() since it wasn't
    used

src/misc.c

@@ -202,13 +202,13 @@ _libssh2_debug(LIBSSH2_SESSION * session, int context, const char *format, ...)
     static const char *const contexts[9] = {
         "Unknown",
         "Transport",
-        "Key Exchange",
+        "Key Ex",
         "Userauth",
-        "Connection",
-        "scp",
-        "SFTP Subsystem",
+        "Conn",
+        "SCP",
+        "SFTP",
         "Failure Event",
-        "Publickey Subsystem",
+        "Publickey",
     };
 
     if (context < 1 || context > 8) {