replica/applylog to store new length along with new mtime in client db
making /sys/src/cmd/replica/updatedb.c:80 happy.

Maybe updatedb should ignore mismatch of lengths.

Reference: /n/sources/patch/maybe/applychanges-loglen
Date: Thu Jan 12 16:02:20 CET 2012
Signed-off-by: yarikos@gmail.com

--- /sys/src/cmd/replica/applychanges.c	Thu Jan 12 15:55:47 2012
+++ /sys/src/cmd/replica/applychanges.c	Thu Jan 12 15:55:43 2012
@@ -101,6 +101,7 @@
 				return;
 			}
 			od.mtime = d.mtime;
+			od.length = d.length;
 			od.muid = "mark";
 			xlog('c', new, &od);
 			if(!justshow){