here's the patch correcting issues with
* a missing </tr>, which currupted Netscape 4.x's display
* cell borders being displayed in konqueror.
* tables without td fields when a class has no derived classes.
I've added a caption for the hierarchy chart - esp. if there are no base
nor derived classes it looks funny & confusing otherwise.

I've tested it with IE 6, Mozilla 1.6, NS 4.78, and W3C's html validator.


git-svn-id: http://root.cern.ch/svn/root/trunk@8083 27541ba8-7e3a-0410-8455-c3a389f83636