A number of footnote bugs.

[Brooks Moses <bmoses@stanford.edu>]

In playing with footnotes on the Wiki, I've come across a number of bugs, 
as well as the questions I mentioned earlier.

Consider the following example text:

   \setupfootnotes[n=3]
   \starttext
    \strut\vfill  % A hack to shorten the page, for Wiki use.
    This\footnote[footA](Or that\footnote{Or the other.}, if you prefer.}
    is a sentence with a footnote\footnote{Actually, two footnotes; this
    one and \in{footnote}[footA] on \at{page}[footA], denoted by
    \note[footA].}.
   \stoptext

This illustrates the following bugs:

1.) Without the \setupfootnotes line, this leaves a vertical space of about 
one blank line between the bottom of the text and the footnote 
separator.  With the \setupfootnotes line, we see that this space is 
proportional to n -- for n=3, it leaves three blank lines.

2.) The columns are ill-spaced in the default case; the footnote markers 
are closer to the column on their left than they are to the column they 
belong to.

3.) Footnotes in footnotes do not produce their numbers in the correct 
order, though they do set the footnotes in the proper order on the bottom 
of the page.  Specifically, the second footnote in the text is 
(incorrectly) numbered 3 rather than 2, but it is (correctly) placed before 
the footnote on the footnote.

4.) According to the comments on lines 63-65 of core-not.tex, setting n=0 
should set the footnotes in a continuous paragraph, using an algorithm from 
the TeXbook.  This does not work at all; the footnotes are set in a single 
column but with a smaller interline space.

Hans, are any of these readily fixable?

- Brooks