[PD] removing iem_matrix from pd-extended

[Hans-Christoph Steiner]

Since the iem_matrix library (NOT iemmatrix) seems to be deprecated  
and unmaintained, and has a name confusingly close to the 'iemmatrix'  
library, I'd like to remove the iem_matrix library and distribute it  
as a standalone libdir.

Objections, comments, etc.?

.hc



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All mankind is of one author, and is one volume; when one man dies,  
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