Send sendmes when we're down 100 cells, not 101.

Send circuit or stream sendme cells when our window has decreased
by 100 cells, not when it has decreased by 101 cells. Bug uncovered
by Karsten when testing the "reduce circuit window" performance
patch. Bugfix on the 54th commit on Tor -- from July 2002,
before the release of Tor 0.0.0. This is the new winner of the
oldest-bug prize.

ChangeLog

@@ -1,4 +1,12 @@
 Changes in version 0.2.1.20 - 2009-??-??
+  o Major bugfixes:
+    - Send circuit or stream sendme cells when our window has decreased
+      by 100 cells, not when it has decreased by 101 cells. Bug uncovered
+      by Karsten when testing the "reduce circuit window" performance
+      patch. Bugfix on the 54th commit on Tor -- from July 2002,
+      before the release of Tor 0.0.0. This is the new winner of the
+      oldest-bug prize.
+
   o New directory authorities:
     - Set up urras (run by Jacob Appelbaum) as the seventh v3 directory
       authority.

src/or/relay.c

@@ -1358,7 +1358,7 @@ connection_edge_consider_sending_sendme(edge_connection_t *conn)
     return;
   }
 
-  while (conn->deliver_window < STREAMWINDOW_START - STREAMWINDOW_INCREMENT) {
+  while (conn->deliver_window <= STREAMWINDOW_START - STREAMWINDOW_INCREMENT) {
     log_debug(conn->cpath_layer?LD_APP:LD_EXIT,
               "Outbuf %d, Queuing stream sendme.",
               (int)conn->_base.outbuf_flushlen);
@@ -1472,7 +1472,7 @@ circuit_consider_sending_sendme(circuit_t *circ, crypt_path_t *layer_hint)
 {
 //  log_fn(LOG_INFO,"Considering: layer_hint is %s",
 //         layer_hint ? "defined" : "null");
-  while ((layer_hint ? layer_hint->deliver_window : circ->deliver_window) <
+  while ((layer_hint ? layer_hint->deliver_window : circ->deliver_window) <=
           CIRCWINDOW_START - CIRCWINDOW_INCREMENT) {
     log_debug(LD_CIRC,"Queuing circuit sendme.");
     if (layer_hint)