Eliminate duplicate code and ease the passage for server-wide options by adding

a -w flag to set-option and show-options and making setw and showw aliases to
set -w and show -w.

Note: setw and showw are still there, but now aliases for set -w and show -w.

tmux.1

@@ -1230,8 +1230,8 @@ command.
 Commands which set options are as follows:
 .Bl -tag -width Ds
 .It Xo Ic set-option
-.Op Fl agu
-.Op Fl t Ar target-session
+.Op Fl aguw
+.Op Fl t Ar target-session | Ar target-window
 .Ar option Ar value
 .Xc
 .D1 (alias: Ic set )
@@ -1249,6 +1249,13 @@ The
 flag unsets an option, so a session inherits the option from the global
 options - it is not possible to unset a global option.
 .Pp
+With
+.Fl w ,
+this command is equivalent to
+.Ic set-window-option 
+with
+.Ar target-window .
+.Pp
 Available session options are:
 .Bl -tag -width Ds
 .It Ic base-index Ar index
@@ -1831,14 +1838,21 @@ as Shift, Alt or Ctrl.
 The default is off.
 .El
 .It Xo Ic show-options
-.Op Fl g
-.Op Fl t Ar target-session
+.Op Fl gw
+.Op Fl t Ar target-session | Ar target-window
 .Xc
 .D1 (alias: Ic show )
 Show the session options for
 .Ar target session ,
 or the global session options with
 .Fl g .
+.Pp
+If
+.Fl w
+is used, this command is equivalent to
+.Ic show-window-options 
+with
+.Ar target-window .
 .It Xo Ic show-window-options
 .Op Fl g
 .Op Fl t Ar target-window