deprecate cedta.override (#7163)

Author: MichaelChirico

R/cedta.R

@@ -1,6 +1,4 @@
 
-cedta.override = NULL  # If no need arises, will deprecate.
-
 cedta.pkgEvalsUserCode = c("gWidgetsWWW","statET","FastRWeb","slidify","rmarkdown","knitr","ezknitr","IRkernel", "rtvs")
 # These packages run user code in their own environment and thus do not
 # themselves Depend or Import data.table. knitr's eval is passed envir=globalenv() so doesn't
@@ -72,7 +70,6 @@ cedta = function(n=2L) {
       (all(c("FUN", "X") %chin% ls(parent.frame(n))) ||
       .any_sd_queries_in_stack(sc))) ||
     (nsname %chin% cedta.pkgEvalsUserCode && .any_eval_calls_in_stack()) ||
-    nsname %chin% cedta.override ||
     isTRUE(ns$.datatable.aware) ||  # As of Sep 2018: RCAS, caretEnsemble, dtplyr, rstanarm, rbokeh, CEMiTool, rqdatatable, RImmPort, BPRMeth, rlist
     tryCatch("data.table" %chin% get(".Depends",paste("package",nsname,sep=":"),inherits=FALSE),error=function(e)FALSE)  # both ns$.Depends and get(.Depends,ns) are not sufficient
   if (!ans && getOption("datatable.verbose")) {