[eigen] no need to call .xpr() anymore

[Benoît Jacob <jacob@xxxxxxxxxxxxxxx>]

Hi List,

this is to announce that we're getting close to API nirvana: no need to 
call .xpr() manually anymore, so one can do:

matrix.row(i) += matrix.row(j)

which makes me happy as it was one of the main initial goals that I hoped 
expression templates would make possible.

Benoit

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