Fixed style bugs in rev.1.12. Rev.1.12 arranged to display the interrupt

Fixed style bugs in rev.1.12.  Rev.1.12 arranged to display the interrupt
number in more cases by stealing 2 characters from the count field to
give more space in the descriptor field, but it did the column adjustments
for this strangely using an off-by-2 error in the base column and
compensating off-by-2 errors in 6 offsets from the base column (4 new
errors and 2 from not changing the offsets that actually changed).

Print the "Interrupts" header directly at its offset from the base column
instead of spacing it half using the offset and half by printing a space
character.