Redirect STDERR to Processing console

[gaocegege]

Now it is full of bugs, some logs in Processing.R will redirect to Processing console, it is confusing to users.

[gaocegege]

There are some useless output in PDE console, we should remove them from the console.

[gaocegege]

It is caused by my mistake. I set VERBOSE_RLANG_MODE to true and some logs are in PDE console. It is not a bug, so close the issue.