borderwidth as a cwmrc(5) keyword, really helps debugging

from okan@
ok oga@

cwmrc.5

@@ -15,7 +15,7 @@
 .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 .\"
 .\" The following requests are required for all man pages.
-.Dd $Mdocdate: July 11 2008 $
+.Dd $Mdocdate: September 22 2008 $
 .Dt CWMRC 5
 .Os
 .Sh NAME
@@ -81,6 +81,10 @@ can be used to remove the named keybinding.
 This can be used to remove a binding which conflicts with an
 application.
 .Pp
+.It Ic borderwidth Ar pixels
+Set the window border width to
+.Ar pixels .
+.Pp
 .It Ic command Ar name Ar path
 Every
 .Ar name