[BUG][FIX] Extended character entity handling in HTML code

Tue Feb 27 07:28:05 UTC 2001

HTML allows you to insert specific character value by number, for
example &#032; is a space.  We can display values in range [9,255]
(similar to HTML 3.2)

This fix ensures that out of range refereneces, e.g. &#8220; are
replaced with suitable substitutes or with a space character, and do not
cause a walkback

This works with 3.0 and with 3.1.

Mike
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