* [CI] Move lint to a separate script
* [CI] Improved lintr launcher
* Add lintr as a separate action
* Add custom parsing logic to print out logs
* Fix lintr issues in demos
* Run R demos
* Fix CRAN checks
* Install XGBoost into R env before running lintr
* Install devtools (needed to run demos)
* Unify logging facilities.
* Enhance `ConsoleLogger` to handle different verbosity.
* Override macros from `dmlc`.
* Don't use specialized gamma when building with GPU.
* Remove verbosity cache in monitor.
* Test monitor.
* Deprecate `silent`.
* Fix doc and messages.
* Fix python test.
* Fix silent tests.
Issue in "demo(package="xgboost", custom_objective)"
> bst <- xgb.train(param, dtrain, num_round, watchlist,
+ objective=logregobj, eval_metric=evalerror)
Error in xgb.train(param, dtrain, num_round, watchlist, objective = logregobj, :
Duplicated term in parameters. Please check your list of params.
