font/gofont: new Smallcaps; update other Go Fonts.

Bigelow & Holmes have prepared new versions of the Go Fonts. The version
numbers have changed from 2.004 to 2.008. ChangeLog:

* New! 2 new fonts, bringing the total to 12: Go Smallcaps and Go
  Smallcaps Italic.
* New! U+FFFD REPLACEMENT CHARACTER glyph added.
* U+00C5 LATIN CAPITAL LETTER A WITH RING ABOVE ring tweaked.
* U+00F0 LATIN SMALL LETTER ETH glyph lightened.
* Superfluous U+0005 <control> glyph removed.
* Split integral, chart draw, block, shade and related glyphs now span
  the full height and have fewer seams when tiled.
* Raised most capital letter diacritics and some lowercase diacritics.
* Mono character widths fixed to be uniform.
* Underline position adjusted.
* SFNT glyph order and cmap table optimized.
* SFNT glyph names (post table) regularized, consistent with the AGLFN.
* ttfautohint upgraded to the latest version, from 1.5 to 1.6.

Change-Id: I0985f07d58b984010199dd723ccdf5892ee59c78
Reviewed-on: https://go-review.googlesource.com/38870
Reviewed-by: Rob Pike <r@golang.org>

font/sfnt/sfnt_test.go

@@ -116,25 +116,23 @@ func TestGoRegularGlyphIndex(t *testing.T) {
 		// The actual values are ad hoc, and result from whatever tools the
 		// Bigelow & Holmes type foundry used and the order in which they
 		// crafted the glyphs. They may change over time as newer versions of
-		// the font are released. In practice, though, running this test with
-		// coverage analysis suggests that it covers both the zero and non-zero
-		// cmapEntry16.offset cases for a format-4 cmap table.
+		// the font are released.
 
-		{'\u0020', 3},   // U+0020 SPACE
-		{'\u0021', 4},   // U+0021 EXCLAMATION MARK
-		{'\u0022', 5},   // U+0022 QUOTATION MARK
-		{'\u0023', 6},   // U+0023 NUMBER SIGN
-		{'\u0024', 223}, // U+0024 DOLLAR SIGN
-		{'\u0025', 7},   // U+0025 PERCENT SIGN
-		{'\u0026', 8},   // U+0026 AMPERSAND
-		{'\u0027', 9},   // U+0027 APOSTROPHE
+		{'\u0020', 3},  // U+0020 SPACE
+		{'\u0021', 4},  // U+0021 EXCLAMATION MARK
+		{'\u0022', 5},  // U+0022 QUOTATION MARK
+		{'\u0023', 6},  // U+0023 NUMBER SIGN
+		{'\u0024', 7},  // U+0024 DOLLAR SIGN
+		{'\u0025', 8},  // U+0025 PERCENT SIGN
+		{'\u0026', 9},  // U+0026 AMPERSAND
+		{'\u0027', 10}, // U+0027 APOSTROPHE
 
-		{'\u03bd', 423}, // U+03BD GREEK SMALL LETTER NU
-		{'\u03be', 424}, // U+03BE GREEK SMALL LETTER XI
-		{'\u03bf', 438}, // U+03BF GREEK SMALL LETTER OMICRON
-		{'\u03c0', 208}, // U+03C0 GREEK SMALL LETTER PI
-		{'\u03c1', 425}, // U+03C1 GREEK SMALL LETTER RHO
-		{'\u03c2', 426}, // U+03C2 GREEK SMALL LETTER FINAL SIGMA
+		{'\u03bd', 396}, // U+03BD GREEK SMALL LETTER NU
+		{'\u03be', 397}, // U+03BE GREEK SMALL LETTER XI
+		{'\u03bf', 398}, // U+03BF GREEK SMALL LETTER OMICRON
+		{'\u03c0', 399}, // U+03C0 GREEK SMALL LETTER PI
+		{'\u03c1', 400}, // U+03C1 GREEK SMALL LETTER RHO
+		{'\u03c2', 401}, // U+03C2 GREEK SMALL LETTER FINAL SIGMA
 	}
 
 	var b Buffer
@@ -559,7 +557,7 @@ func TestGlyphName(t *testing.T) {
 		r    rune
 		want string
 	}{
-		{'\x00', "NULL"},
+		{'\x00', "uni0000"},
 		{'!', "exclam"},
 		{'A', "A"},
 		{'{', "braceleft"},