bug on cancor (PR#116)

[Martin Maechler]

In the ``release-patch'' aka 0.63.3  version, the  functions
qr.xxx  *have* changed about 10 days ago.

NEWS has

    o	backsolve(), qr.solve... now return a vector when x (or y) is a vector.


In today's snapshot,

  > library(mva)
  > str(cancor(1:9,c(1:4,6:10)))
  List of 5
   $ cor    : num 0.997
   $ xcoef  : num 0.129
   $ ycoef  : num 0.110
   $ xcenter: num 5
   $ ycenter: num 5.56

However, 
I'm not sure if this addresses all issues (apart from docu)
that Prof Ripley has addressed. 

Martin
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