REXML changes

* The main purpose for this change is to get a fix in for nasty bug in XPath.
  In the new code for the descendant-or-self axis, the document order code
  was calling the wrong method to do node comparisons, causing a terrible
  overhead that slowed the axis down to the point where it was unusable.
  This is a common axis, also known as '//', so this fix is critical.
* Using Element#text= on a non-Text, non-String argument caused an error.
  This has been changed so that the behavior is like puts() -- to_s() is
  called on the object first.
* Refactored the pretty-printing code a little.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@6072 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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