[Rd] biplot(mva): argument main causes a warning

[Wolfram Fischer - Z/I/M]

PROBLEM
        If `main' is given as argument to biplot() a warning appears:
        parameter "main" couldn't be set in high-level plot() function

PROPOSAL FOR A SOLUTION
        biplot.default( ....., main=NULL, ...){
                ...
                plot( ......, main=main, ... )
                ...
                plot( ......, main=main, ... )
                ...
        }
        
Wolfram

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