doc ends in last line of page, col n or n-1
.T#, .th
.dp 2, add 1 to need, max with page length
.br before .ne before dp 1/2
.p is page header (old .ph)
.fg in .dp 1 may produce wrong page # in Table of Figures
    into display diversion string ref which evaluates to null,
    with side effect of adding TOF entry into TOC diversion
