[daip] IMAGR. UVWTFN, ROBUST

[Amy Mioduszewski]

Hi Gustaaf,

I think this is simply a problem with the IMAGR's HELP file, which
is misleading.  It looks like UVWTFN 'UN' doesn't mean anything
and therefore ROBUST is used to weight.  So, ROBUST 0 + UVWTFN = ''
is equivalent to ROBUST 0 + UVWTFN = 'UN'.

UVWTFN 'N*' -- natural weighting
UVWTFN 'C*' -- uniform weighting
UVWTFN '*O' -- set all weights to 1
UVWTFN '*V' -- take the forth root of the weights

I will make the HELP file clearer.

Cheers,

Amy