Silent check warning on DT import

All the code for the Shiny app is in `inst` and so is invisible to the
check (it's not technically package code). DT is not used anywhere else
nor in explicit namespace imports, which leads to the warning. Added a
dummy function that contains a call to a function from DT so that the
check sees that DT is used at all.

References #103.

Author: mbojan

R/run_sw.R

@@ -18,3 +18,11 @@
 run_sw <- function() {
   shiny::runApp(system.file("shiny/statnetWeb", package = "statnetWeb"))
 }
+
+tame_rcmd_check <- function() {
+  # Let R CMD check find a instance of using DT. The shiny app code is in
+  # `inst` so invisible to the check.
+  DT::DTOutput()
+  stop("don't call `tame_rcmd_check()`")
+  NULL
+}