implemented viewextend and added M-S-C-n shortcuts for extending the current view... updated man page (works great!) nice feature

dwm.1

@@ -36,14 +36,21 @@ prints version information to standard output, then exits.
 .B Standard input
 is read and displayed in the status text area.
 .TP
-.B Button[1-3]
-click on a tag label focuses that tag.
+.B Button[1,3]
+click on a tag label focuses that
+.B tag.
+.TP
+.B Button2
+click on a tag label (un)extends the current
+.B tag.
 .TP
 .B Button[1,4]
-click on the bar focuses the previous tag.
+click on the bar focuses the previous
+.B tag.
 .TP
 .B Button[2,5]
-click on the bar focuses the next tag.
+click on the bar focuses the next
+.B tag.
 .SS Keyboard commands
 .TP
 .B Mod1-Return
@@ -108,6 +115,12 @@ Append
 .B nth tag
 to current
 .B window.
+.TP
+.B Mod1-Control-Shift-[0..n]
+(Un)extends
+.B nth tag
+with current
+.B tag.
 .SS Mouse commands
 .TP
 .B Mod1-Button1