If a paragraph has a few foot notes towards the bottom of the page, and the
footnote body cannot fit into the remaining page, FOP would crash. This patch 
doesn't solve the problem, but it simply trap the error and skip the footnote 
body and output a message after the page number so that the user still get a 
pdf file to visually examine where the missing footnote might be and maybe
rearrange his text to fit. I think this is better than FOP just dying without
generating a pdf file. 

Some better solution may be:
(1) properly move the footnote to next page (i.e. say, last line of
page 1 has a footnote refering to footnote 1, but the footnote body itself
only appears in bottom of page 2).
(2) temperarily lengthen the page content size, get the footnote overhanging 
below the nominal bottom of page and output a message to tell user to rearrange 
his text. 
 
I had a look around Footnote.java and FootnoteBody.java for a few hours but 
neither look too easy, so I gave up. I think ideally the behaviour should
be similar to latex i.e. fit as much of footnote 1 into bottom of page 1,
and output the rest to bottom of page two, but since FOP doesn'timplement 
xsl-footnote-separator yet, this may be a bit confusing visually.

--------------------------------------------
*** /home/LEUNGH2/xml-fop/src/org/apache/fop/fo/flow/FootnoteBody.java-org
	Sun Mar  4 21:34:52 2001
--- /home/LEUNGH2/xml-fop/src/org/apache/fop/fo/flow/FootnoteBody.java	Sat 
Jul  7 00:40:46 2001
***************
*** 108,114 ****
        for ( int i = this.marker; i < numChildren; i++ ) {
  	FONode fo = (FONode) children.elementAt(i);
  	Status status;
! 	if ( (status = fo.layout(blockArea)).isIncomplete() ) {
  	  this.resetMarker();
  	  return status;
  	}
--- 108,125 ----
        for ( int i = this.marker; i < numChildren; i++ ) {
  	FONode fo = (FONode) children.elementAt(i);
  	Status status;
!       try {
!         status = fo.layout(blockArea); 
!       } catch (NullPointerException e) {
!         System.out.println("");
!         System.out.println("***A paragraph near the bottom of the page has a 
footnote");
!         System.out.println("***which is too big to fit into the remaining");
!         System.out.println("***available space. The footnote is being 
skipped.");
!         System.out.println("***Please rewrite the paragraph or the footnote 
body.");
! 	  this.resetMarker();
! 	  return new Status(Status.OK);
!       };
! 	if ( status.isIncomplete() ) {
  	  this.resetMarker();
  	  return status;
  	}