j.f.chandler  aug 1986   subroutine dcrfrm
routine for loading d-inv*f matrix from ppr nrmeqs
notation:
'mparam': saved parameter set, composed of 'ncparm' interesting
and 'ndparm' uninteresting parameters
'nparam': current parameter set; some overlap with 'mparam', 'ncparm',
and 'ndparm'.  the latter intersections are 'ncr' and 'ndr'

at this point:
icrest(1-ncparm) --> mparam
idrest(1-ndparm) --> mparam
iptr(1-mparam) --> nparam

now get ptrs from 'ncparm', 'ndparm', 'nparam' to 'ncr','ndr'
icrest(1-ncparm) --> ncr
idrest(1-ndparm) --> ndr
jptrc(1-nparam) --> ncr
jptrd(1-nparam) --> ndr