[project @ 1999-04-08 15:43:44 by simonm]

Don't set the cost centre when entering a PAP.  Either:

	-  it's fully applied, in which case we're about to
	   set the CCS in the function anyway, or

	-  we're about to build another PAP in which case the
	   costs get attributed to the current CCS.

This avoids appending CCSs twice in some cases.