Merge code cleanups
Fixes another bug related to the formatting code refactoring in 3.1.7

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8_6@12853 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

  Fixed a double-encoding bug.  This was a regression, related
  to ticket:48.
  r1292@bean:  ser | 2007-07-25 08:19:36 -0400
   r1279@bean:  ser | 2007-06-09 23:19:02 -0400
   Fixes ticket:89 -- encoding CP-1252 was broken.  ISO-8859-15 had the same
   problem.
   
   Also in this patch is a fix to merge.rb (unused, but it should at least
   contain no errors), and a unit test for ticket:88.
  
  r1293@bean:  ser | 2007-07-25 08:19:37 -0400
   r1281@bean:  ser | 2007-07-24 11:08:48 -0400
   Addresses ticket:85
   
   This is a major rewrite of the XML formatting code.  The XML writers have all
   been extracted out of the classes and put into their own class containers.
   This makes writing parsers easier, and cleaner.
   
   There are three formatters, which correspond to the previous three XML writing
   modes:
   
     REXML::Formatters::Default    
         Prints the XML document exactly as it was parsed
     REXML::Formatters::Pretty     
         Pretty prints the XML document, destroying whitespace in the document
     REXML::Formatters::Transitive 
         Pretty prints the XML document, preserving whitespace
   
   All of the write() functions have been deprecated (some are still used, but
   these will also go away) except the write() function on Document, which is left
   for convenience.  To pretty print an XML document the canonical way:
   
     formatter = REXML::Formatters::Pretty.new( 5 ) # indent by 5 spaces
     formatter.write( document, output )
   
  r1296@bean:  ser | 2007-07-25 08:19:40 -0400
   r1287@bean:  ser | 2007-07-24 20:12:25 -0400
   Applied patch from Jeff Barczewski.  Note that this changes what the values of
   the name and IDs are from the previous behavior -- the values no longer include
   the quotes.  This is the correct behavior, so I'm leaving it in, but it is not
   backwards compatible.  Also fixes the serializer so that it outputs the doctype
   in a correct format (needed as a result of this change).
  
  r1297@bean:  ser | 2007-07-25 08:38:38 -0400
  Version update
  r1298@bean:  ser | 2007-07-25 08:40:30 -0400
   r1291@bean (orig r12517):  ryan | 2007-06-11 20:38:57 -0400
   Fixed typo in code. Fixes bug #10420
  
 
 r1304@bean:  ser | 2007-07-27 22:34:18 -0400
 Whitespace changes only


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* Fixes ticket:68.

  ***** Note that this is an API change!!! *****

  NOTE that this involves an API change!  Entity declarations in the doctype now
  generate events that carry two, not one, arguments.

* Implements ticket:15, using gwrite's suggestion.  This allows Element to be
  subclassed.

* Fixed namespaces handling in XPath and element.

  ***** Note that this is an API change!!! *****

  Element.namespaces() now returns a hash of namespace mappings which are
  relevant for that node.

* Fixes a bug in multiple decodings

* The changeset 1230:1231 was bad.  The default behavior is *not* to use the
  native REXML encodings by default, but rather to use ICONV by default.  I'll
  have to think of a better way of managing translations, but the REXML codecs
  are (a) less reliable than ICONV, but more importantly (b) slower.  The real
  solution is to use ICONV by default, but allow users to specify that they
  want to use the pure Ruby codecs.

* Fixes ticket:61 (xpath_parser)

* Fixes ticket:63 (UTF-16; UNILE decoding was bad)

* Improves parsing error messages a little

* Adds the ability to override the encoding detection in Source construction

* Fixes an edge case in Functions::string, where document nodes weren't
  correctly converted

  * Fixes Functions::string() for Element and Document nodes

  * Fixes some problems in entity handling

* Addresses ticket:66

* Fixes ticket:71

* Addresses ticket:78

    NOTE: that this also fixes what is technically another bug in REXML.  REXML's
    XPath parser used to allow exponential notation in numbers.  The XPath spec
    is specific about what a number is, and scientific notation is not included.
    Therefore, this has been fixed.


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* Minor source documentation changes
* Changes to the pretty-printing code, including the addition of the word-
  wrap submission.
* Bug fix for missing quotations in NOTATION DTD items
* Bug fixes and improvements to whitespace handling in text nodes
* Refactoring and bug fixes in encoding support
* Minor speed optimizations in the core parser
* Bug fixes in the SAX2 parserthe core parser
* Copyright fixes
* Version bump to REXML 3.0.0
* A change that caused speed degredation has been reversed
* Addition of a value=() method in Text, for replacing the contents of
  a text node
* Fixed the document order of the descendant-or-self axis in XPath


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