Display a list of difmap configuration parameters.
EXAMPLE
-------

0>showpar
Difmap configuration state:
mapunits mas
select I, 1, 1
uvtaper 0, 0
uvrange 0, 0
uvweight 2, 0, false
uvzero 0
selftaper 0, 0
selflims 0, 0
xyrange 0, 0, 0, 0
integer niter; niter=100
float gain; gain=0.05
float cutoff; cutoff=0
float cmul; cmul=0
logical docont; docont=true
mapcolor grey, 1.000000, 0.500000
mapfunc linear, 0.000000, 0.000000
string vflags; vflags=""
string rflags; rflags=""
string pflags; pflags=""
selfflag true, 3, 4
float levs(1)
levs(1:1) = 0
0>

CONTEXT
-------
Some aspects of Difmap behavior are controlled by parameters set
through configuration variables and commands. The 'showpar' command
lists the current state of these parameters. It does this in an
indirect manner, by showing the command file that the 'save' command
would record if invoked to record difmap's internal state.

This is not the most convenient way that one could conceive of, but
unless I get a chance to re-write the difmap interface, I have
little choice but to show the parameters in this fashion.