Documentation/unicode.txt: convert it to ReST markup

Probably, unicode is something that we might remove from the
docs, as all modern systems support it. Yet, this chapter
is fun, as it mentions support for the Klington fictional
charset ;)

On the other hand, I bet all other OS user manuals
explicit mention unicode support.

So, convert it to ReST and include it at the user's book.
Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>

Documentation/unicode.txt

+Unicode support
+===============
+
 		 Last update: 2005-01-17, version 1.4
 
 This file is maintained by H. Peter Anvin <unicode@lanana.org> as part
@@ -6,7 +9,8 @@ The current version can be found at:
 
 	    http://www.lanana.org/docs/unicode/unicode.txt
 
-		       ------------------------
+Introdution
+-----------
 
 The Linux kernel code has been rewritten to use Unicode to map
 characters to fonts.  By downloading a single Unicode-to-font table,
@@ -16,12 +20,14 @@ the font as indicated.
 This changes the semantics of the eight-bit character tables subtly.
 The four character tables are now:
 
+=============== =============================== ================
 Map symbol	Map name			Escape code (G0)
-
+=============== =============================== ================
 LAT1_MAP	Latin-1 (ISO 8859-1)		ESC ( B
 GRAF_MAP	DEC VT100 pseudographics	ESC ( 0
 IBMPC_MAP	IBM code page 437		ESC ( U
 USER_MAP	User defined			ESC ( K
+=============== =============================== ================
 
 In particular, ESC ( U is no longer "straight to font", since the font
 might be completely different than the IBM character set.  This
@@ -55,10 +61,12 @@ In addition, the following characters not present in Unicode 1.1.4
 have been defined; these are used by the DEC VT graphics map.  [v1.2]
 THIS USE IS OBSOLETE AND SHOULD NO LONGER BE USED; PLEASE SEE BELOW.
 
+====== ======================================
 U+F800 DEC VT GRAPHICS HORIZONTAL LINE SCAN 1
 U+F801 DEC VT GRAPHICS HORIZONTAL LINE SCAN 3
 U+F803 DEC VT GRAPHICS HORIZONTAL LINE SCAN 7
 U+F804 DEC VT GRAPHICS HORIZONTAL LINE SCAN 9
+====== ======================================
 
 The DEC VT220 uses a 6x10 character matrix, and these characters form
 a smooth progression in the DEC VT graphics character set.  I have
@@ -74,10 +82,12 @@ keyboard symbols that are unlikely to ever be added to Unicode proper
 since they are horribly vendor-specific.  This, of course, is an
 excellent example of horrible design.
 
+====== ======================================
 U+F810 KEYBOARD SYMBOL FLYING FLAG
 U+F811 KEYBOARD SYMBOL PULLDOWN MENU
 U+F812 KEYBOARD SYMBOL OPEN APPLE
 U+F813 KEYBOARD SYMBOL SOLID APPLE
+====== ======================================
 
 Klingon language support
 ------------------------
@@ -99,8 +109,10 @@ of the dingbats/symbols/forms type and this is a language, I have
 located it at the end, on a 16-cell boundary in keeping with standard
 Unicode practice.
 
-NOTE: This range is now officially managed by the ConScript Unicode
-Registry.  The normative reference is at:
+.. note::
+
+  This range is now officially managed by the ConScript Unicode
+  Registry.  The normative reference is at:
 
 	http://www.evertype.com/standards/csur/klingon.html
 
@@ -112,6 +124,7 @@ However, since the set of symbols appear to be consistent throughout,
 with only the actual shapes being different, in keeping with standard
 Unicode practice these differences are considered font variants.
 
+======	=======================================================
 U+F8D0	KLINGON LETTER A
 U+F8D1	KLINGON LETTER B
 U+F8D2	KLINGON LETTER CH
@@ -155,6 +168,7 @@ U+F8F9	KLINGON DIGIT NINE
 U+F8FD	KLINGON COMMA
 U+F8FE	KLINGON FULL STOP
 U+F8FF	KLINGON SYMBOL FOR EMPIRE
+======	=======================================================
 
 Other Fictional and Artificial Scripts
 --------------------------------------