[datatable-help] 1.7.6 submitted to CRAN

[Matthew Dowle]

( This clears all known bugs. If there's something you're waiting for
that's not on the bug or FR list then it may have been forgotten -
please feel free to add it to the tracker. )


NEW FEATURES

o   An empty list column can now be added with :=, and
    data.table() accepts empty list().
        DT[,newcol:=list()]
        data.table(a=1:3,b=list())
    Empty list columns contain NULL for all rows.
        
BUG FIXES

o   Adding a column to a data.table loaded from disk could
    result in a memory corruption in R <= 2.13.2, revealed
    and thanks to CRAN checks on windows old-rel.
        
o   Adding a factor column with a RHS to be recycled no longer
    loses its factor attribute, #1691. Thanks to Damian
    Betebenner for reporting.