this subroutine provides the services required to calculate
and display the series-by-series adjustments.  it is called
at different entry points by - - nrmadd, snorml, solctl,
and soluse.

find ser-by-ser solution - - 1) read rhs from data set sdset,
2) multiply by the covariance matrix, and 3) write onto data
set solset
data sets defined at entry setsd