pic - eqn bug fix

[Yuval Tamir]

Re:
   Description:
	   if you use eqn-formatted text in a pic picture, the components
	   don't line up right.

   Cause:
	   pic recovers from its line feeds with a .sp -1.  eqn sometimes
	   uses \x to reserve extra white space below the line.

   Cure:
	   tell pic to say .sp -1-\n(.a instead of .sp -1.
---------------------------------------
There is a better cure given on page 16 of the pic manual.
Use #space 0 {x over y}# instead of #x over y#.

					Yuval Tamir