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Version History:

 2.2 2006-03-15 Suppress IntelliJ Code Analyse that wants to make this default scope.

 2.3 2008-02-15 complete rewrite, mainly to handle removing space around <dt> <li> <h?> and <td> tags.

 2.4 2008-02-15 add more tags that get trimmed. Charge $10

 2.5 2008-02-28 tighter removal of whitespace surrounding comments.

 2.6 2008-02-28 optionally allow comments to be stripped out
                entirely. Preserve some space around configurable magic
                macro comments that expand into text such as <!# SSI or
                <!-- macro.

 2.7 2008-07-27 remove all space just before > in a tag. < space will convert to &lt; space.

 2.8 2009-04-04 no longer correct missing entities. Just issue warning messages.

 2.9 2010-01-18 refactor so you first allocate a Compactor object, permitting simultaneous compactings.

 3.0 2010-02-12 trim space inside <p>..</p>.

 3.1 2010-12-21 avoid touching JavaScript and other scripts.

 3.2 2010-12-24 handle <script and <?

 3.3 2011-11-15 add compactStringAsNeeded

 3.4 2012-06-18 no longer strip \n in front of <script

 3.5 2012-10-27 show more context where there is an error.

 3.6 2013-03-01 no longer complain about unescaped " in text.

 3.7 2014-04-21 now allow *.htmlfrag files.

 3.8 2014-06-11 add HTML5 tags. Simplify tag categorisation code.

 3.9 2014-07-26 internal simplication. Now preserves space both before and after comment which may be significant.
                Now always compact space inside comments, even macro comments.

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