Add some missing punctuation symbols, in particular @ which (according to

a recent Press Association release) was added to Morse code by the ITU in
December. @ was previously used for the SK prosign, which is now spelt &.

Obtained from:  http://en.wikipedia.org/wiki/Morse_code

games/morse/morse.6

@@ -102,7 +102,7 @@ Not all prosigns have corresponding characters. Use
 .Ql #
 for
 .Em AS ,
-.Ql @
+.Ql &
 for
 .Em SK ,
 .Ql *

games/morse/morse.c

@@ -120,6 +120,8 @@ static const struct morsetab mtab[] = {
 
 	{',', "--..--"},
 	{'.', ".-.-.-"},
+	{'"', ".-..-."},
+	{'!', "..--."},
 	{'?', "..--.."},
 	{'/', "-..-."},
 	{'-', "-....-"},
@@ -130,11 +132,12 @@ static const struct morsetab mtab[] = {
 	{')', "-.--.-"},
 	{'$', "...-..-"},
 	{'+', ".-.-."},		/* AR */
+	{'@', ".--.-."}
 
 	/* prosigns without already assigned values */
 
 	{'#', ".-..."},		/* AS */
-	{'@', "...-.-"},	/* SK */
+	{'&', "...-.-"},	/* SK */
 	{'*', "...-."},		/* VE */
 	{'%', "-...-.-"},	/* BK */