Update tune format files. In the main one, just remove a couple of now deprecated settings that did nothing anyway. For the web format, which is actually the format used to generate the downloadable PDFs, bring it into line with the main format but leave the margins at the default settings. Also remove the deprecated settings.

% Format for a graphic with a single tune
continueall false
measurenb false
writefields SRBDZHN 0
titleformat Y0
titlespace 0
topspace 0
infoline false
writehistory false
musiconly true
scale 0.9
botmargin 0pt
leftmargin 0pt
rightmarin 0pt
topmargin 0pt