augment() for plm models does not calculate fitted values correctly about broom

see also an old discussion about fitted values in panelmodels produced by plm:
https://stat.ethz.ch/pipermail/r-help/2010-October/256992.html

there is also plm:::fitted.plm() which is not exported and plm:::fitted.panelmodel() (not exported and broken), but both don't give us depvar - residuals.

The mismatch is likely due to the implementation of residuals() for plm objects, see http://stats.stackexchange.com/questions/183206/package-plm-random-effect-residuals

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