Adjust some of the std.ascii function names to be more descriptive.

Given that these functions probably aren't used very often, we'd
probably be better of making their names longer and more descriptive as
Lars suggested. So, they're now isPrintible, isGraphical, and
isPunctuation.

std/ascii.d

@@ -212,7 +212,7 @@ unittest
     Whether or not $(D c) is a punctuation character. That includes all ASCII
     characters which are not control characters, letters, digits, or whitespace.
   +/
-bool isPunct(dchar c) @safe pure nothrow
+bool isPunctuation(dchar c) @safe pure nothrow
 {
     return c <= 0x7F ? cast(bool)(_ctype[c] & _PNC) : false;
 }
@@ -222,9 +222,9 @@ unittest
     foreach(dchar c; iota(0, 128))
     {
         if(isControl(c) || isAlphaNum(c) || c == ' ')
-            assert(!isPunct(c));
+            assert(!isPunctuation(c));
         else
-            assert(isPunct(c));
+            assert(isPunctuation(c));
     }
 }
 
@@ -233,7 +233,7 @@ unittest
     Whether or not $(D c) is a printable character other than the space
     character.
   +/
-bool isGraph(dchar c) @safe pure nothrow
+bool isGraphical(dchar c) @safe pure nothrow
 {
     return c <= 0x7F ? cast(bool)(_ctype[c] & (_ALP|_DIG|_PNC)) : false;
 }
@@ -243,9 +243,9 @@ unittest
     foreach(dchar c; iota(0, 128))
     {
         if(isControl(c) || c == ' ')
-            assert(!isGraph(c));
+            assert(!isGraphical(c));
         else
-            assert(isGraph(c));
+            assert(isGraphical(c));
     }
 }
 
@@ -253,7 +253,7 @@ unittest
     Whether or not $(D c) is a printable character - including the space
     character.
   +/
-bool isPrint(dchar c) @safe pure nothrow
+bool isPrintable(dchar c) @safe pure nothrow
 {
     return c <= 0x7F ? cast(bool)(_ctype[c] & (_ALP|_DIG|_PNC|_BLK)) : false;
 }
@@ -263,9 +263,9 @@ unittest
     foreach(dchar c; iota(0, 128))
     {
         if(isControl(c))
-            assert(!isPrint(c));
+            assert(!isPrintable(c));
         else
-            assert(isPrint(c));
+            assert(isPrintable(c));
     }
 }