[datatable-help] by=.EACHI and related - please check ok

[Matt Dowle]

Dear all,

by=.EACHI is now implemented and available in v1.9.3 from R-Forge.

Please take a look at NEWS and see what you think :
https://r-forge.r-project.org/scm/viewvc.php/pkg/NEWS?view=markup&root=datatable

Quite a few related bugs and feature requests get resolved by this, 
still going through them updating NEWS and adding tests.  Thanks to all.

The changes are very much up for debate and change at this stage.

Matt