Added tests that names are ok when not all items are named, #2029 e.g. names(dt[,list(x,y,a=y)]).  This may have temporarily not worked in SVN version only, but seems to be working now. Thanks to Chris.
Added tests that names are ok when not all items are named, #2029 e.g. names(dt[,list(x,y,a=y)]).  This may have temporarily not worked in SVN version only, but seems to be working now. Thanks to Chris.

vlulla/data.table,jangorecki/data.table,Rdatatable/data.table,jangorecki/data.table,vlulla/data.table,vlulla/data.table,Rdatatable/data.table,jangorecki/data.table,Rdatatable/data.table,vlulla/data.table,jangorecki/data.table,Rdatatable/data.table