[dev-context] supp-pdf commented in context.tex

On line 130 in context.tex, \input supp-pdf.tex has been commented out. I assume this is because its functionality has been superseded by something else (pdfetex extensions?) In any case, I have no problems when running pdfetex jobs, but: running jobs with the aleph engine this ommission causes errors: ! Undefined control sequence. \dogetfiguresizepdf ...3#4#5#6->\dogetPDFmediabox when using \externalfigure and suchlike. Is it safe for me to just uncomment that line in context.tex (which fixes the problem here) or is that risky for other things? Thanks, Duncan