Log Message:
Update converters/bibtex2html to 1.80

Version 1.80, 15/3/2006
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 o remove leading ./ in front of relative URLs (was introduced a long
   time ago to circumvent an Internet Explorer bug; see below)
 o no more escaping of the character & in URLs

Version 1.79, 22/2/2006
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 o fixed bug with ISO-latin characters in bib2bib conditions
 o fixed bug with implicit abbrevs (jan, feb, etc.)