Closes #2969, removes obsolete part of .internal.selfref warning since R dependency is 3.1.0 (#2981)
Closes #2969, removes obsolete part of .internal.selfref warning since R dependency is 3.1.0 (#2981)


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