FUTURE: Use do.call(fcn, ...) - not do.call("fcn", ...)

[HenrikBengtsson]

When calling a function via do.call(), specify the function by itself and not by its name, e.g.

## GOOD
y <- do.call(backgroundCorrect, args=args)

## BAD
y <- do.call("backgroundCorrect", args=args)

The former will cause backgroundCorrect() to be identified as a global object by the globals such that it is properly exported when evaluated by a future.