number_pad (modified from <Someone>'s patch)

The number_pad option can now optionally hold a value
{0,1, 2 } for {off, on, DOS-mode} but plain number_pad and
!number_pad in config files still work as before.

When number_pad:2 is set, iflags.num_pad_mode is set to 1
which triggers the following behaviour:
> '5', M('5') and M('0') are mapped in rhack()
>in cmd.c, only when they are entered as a command. When used as a
>number, like in the 'n' command, no mapping takes place. '0' is
>already mapped to 'i' by the core. The
>only difference [<Someone>] left in (deliberately) is when you press Ctrl-0;
>this used to map to C('i'), which is an invalid command; now
>keep it '0' (which is interpreted as 'i' by the core.)

sys/msdos/msdos.c

@@ -178,13 +178,13 @@ static const struct pad {
 			{'9', M('9'), '9'},		/* 9 */
 			{'m', C('p'), C('p')},		/* - */
 			{'4', M('4'), '4'},		/* 4 */
-			{'g', 'G', 'g'},		/* 5 */
+			{'5', M('5'), '5'},		/* 5 */
 			{'6', M('6'), '6'},		/* 6 */
 			{'p', 'P', C('p')},		/* + */
 			{'1', M('1'), '1'},		/* 1 */
 			{'2', M('2'), '2'},		/* 2 */
 			{'3', M('3'), '3'},		/* 3 */
-			{'i', 'I', C('i')},		/* Ins */
+			{'0', M('0'), '0'},		/* Ins */
 			{'.', ':', ':'}			/* Del */
 #endif
 };

sys/winnt/nhdefkey.c

@@ -81,13 +81,13 @@ static const struct pad {
 			{'9', M('9'), '9'},		/* 9 */
 			{'m', C('p'), C('p')},		/* - */
 			{'4', M('4'), '4'},		/* 4 */
-			{'g', 'G', 'g'},		/* 5 */
+			{'5', M('5'), '5'},		/* 5 */
 			{'6', M('6'), '6'},		/* 6 */
 			{'+', 'P', C('p')},		/* + */
 			{'1', M('1'), '1'},		/* 1 */
 			{'2', M('2'), '2'},		/* 2 */
 			{'3', M('3'), '3'},		/* 3 */
-			{'i', 'I', C('i')},		/* Ins */
+			{'0', M('0'), '0'},		/* Ins */
 			{'.', ':', ':'}			/* Del */
 };