deactivate froll tests

Author: ben-schwen

tests/froll.R

@@ -1,2 +1,3 @@
 require(data.table)
-test.data.table(script="froll.Rraw")
+minor_version = as.integer(strsplit(packageDescription("data.table")$Version, "\\.")[[1]][[3]])
+if (minor_version == 99L && Sys.getenv("RunAllDataTableTests") != "no") test.data.table(script="froll.Rraw")