Add three new copy-mode commands - select-line, copy-line,

copy-end-of-line. From Dave Disser and Randy Stauner a while back.

tmux.h

@@ -461,6 +461,8 @@ enum mode_key_cmd {
 	MODEKEYCOPY_BOTTOMLINE,
 	MODEKEYCOPY_CANCEL,
 	MODEKEYCOPY_CLEARSELECTION,
+	MODEKEYCOPY_COPYLINE,
+	MODEKEYCOPY_COPYENDOFLINE,
 	MODEKEYCOPY_COPYSELECTION,
 	MODEKEYCOPY_DOWN,
 	MODEKEYCOPY_ENDOFLINE,
@@ -491,6 +493,7 @@ enum mode_key_cmd {
 	MODEKEYCOPY_SEARCHDOWN,
 	MODEKEYCOPY_SEARCHREVERSE,
 	MODEKEYCOPY_SEARCHUP,
+	MODEKEYCOPY_SELECTLINE,
 	MODEKEYCOPY_STARTNUMBERPREFIX,
 	MODEKEYCOPY_STARTOFLINE,
 	MODEKEYCOPY_STARTSELECTION,