[dev-context] Yet another footnote bug (or two).

[Brooks Moses]

Again, from playing with footnote examples on the Wiki.

     \starttext
     {\bfd This is text\footnote{And a footnote.}.}
     This is text\footnote{With a footnote.}.
     \stoptext

The footnote symbol shows up appropriately sized for normal text, not for 
the extra-large text.  (It is boldface, though.)

On the other hand, in chapter headings, the opposite problem occurs -- the 
footnote is too large.  Note, in the following example, that the footnote 
in the chapter heading is a good bit larger than the x-height of the 
neighboring font, whereas the footnote in the ordinary text is a little bit 
smaller than the x-height of the neighboring font.

     \starttext
     \chapter{This is a chapter\footnote{And a footnote.}.}
     This is text\footnote{With a footnote.}.
     \stoptext

- Brooks