Log Message:
Update p5-XML-DT to 0.56.

Changes from previous:
0.56  Feb 12, 2011
        - Removed debug message :-/

0.55  Feb 12, 2011
        - Process correctly entities (I think)

0.54  Nov 19, 2010
        - require 5.8.6
        - minor changes;        

0.53  Jan 18, 2009
        - added 'inpath' function.

0.52  Oct 22, 2008
        - fixed bug on whitepc function.

0.51  Feb 22, 2008
        - tohtml function with better handle of specific HTML tags

0.50  Feb 21, 2008
        - Fixed a problem with HFS+ extended attributes

0.49  Feb 21, 2008
        - Fixed a typo

0.48  Feb 21, 2008
        - added tohtml function. Does the same as toxml, but does not 
          create empty tags.
        - use -tohtml=>1 in a handler to use tohtml instead of toxml