[pca] Option --minimal questions

[Martin Paul]

Brookins, Neil (Philadelphia) wrote:
> 1) Thank you for clarifying the use of --minimal. I now understand that its
> only intended to be used with missingr.  For the benefit of other confused
> people like me, would it make sense for pca to display a warning when
> --minimal is used with any other combination of operand?

I've now added a sentence about that issue to the documentation of the "minimal" 
option, and also made PCA show a warning when "--minimal" is used with anything 
but "missingr" alone.

Martin.