Commit Briefs
silence more warnings
R=rsc http://codereview.appspot.com/6744056
9p: tflag sorts by mtime
R=rsc CC=codebot http://codereview.appspot.com/1265043
R=rsc http://codereview.appspot.com/6744056
R=rsc CC=codebot http://codereview.appspot.com/1265043