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Version History:

 1.0 2004-01-01 initial version

 1.1 2004-01-01 optimise using
                text.indexOf('&') and sb.append(string) rather
                than processing character by character.

 1.2 2004-07-21 add stripHTMLTags -
                stripFile also strips tags - add stripNbsp

 1.3 2005-06-20 fix bug in possEntityToChar
                exposed possEntityToChar as public

 1.4 2005-07-02 check for null input

 1.5 2005-07-29 no longer needs entitiestochar.ser
                file. Converted to JDK 1.5 back to 1,2

 1.6 2005-09-05 faster code for stripHTMLTags that
                returns original string if nothing changed.

 1.7 2005-09-05

 1.8 2007-02-26 fix bug. hex entity it  not &x#ffff;

 1.9 2007-03-26

 2.0 2007-04-26

 2.1 2007-05-10

 2.2 2007-05-14 StripHTMLTags now strips applet, style, script pairs.
                generate hex entities as comments in entitycase.javafrag

 2.3 2008-07-29 refactor code for Entities, add notes to chars, add a few new missing Entities.

 2.4 2008-08-05 add translateNbspTo parameter to several methods and deprecate the versions without it.
                This allows you to directly control how   is translated, usually ' ' or (char)160.
                Renamed methods to make it clearer just what sort of input is expect.

 2.5 2008-08-06 add ability to insert XML entities. Convert to JDK 1.5+, with generics, and for:each, StringBuilder

 2.6 2009-04-05 StripEntities now leaves a space behind when it removes a <br><p><td> etc tag.

 2.7 2009-11-14 generate a table for the HTML cheat sheet of quote-like entities.

 2.8 2009-12-22 export table on HTML 5 entities. Now import csv file rather than embed entity facts.

 2.9 2010-01-29 export XHTML entities (currently same as HTML-4 entities).

 3.0 2011-02-10 rename classes and methods. Add file utilities for Entify, DeEntify, Flatten.
                StripEntities -> DeEntifyStrings,
                InsertEntities -> EntifyStrings,
                stripHTMLEntities -> deEntifyHTML,
                insertHTMLEntities -> entifyHTML.

 3.1 2011-09-02 correct error in tables reversing Y dierisis and y dieresis. Correct upper/lower categories in table.

 3.2 2014-08-02 add code b, and the space category.

 3.3 2014-08-24 add musical symbols and support for chars without alpha entities.

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