Screen a function for use of functions forbidden by data system style guide.
screen_forbidden(fn)The function to be tested. This is the actual function object, not the name of the function.
Nx2 Character matrix of flagged lines and the test that tripped them (empty vector, if none)
Certain functions are forbidden by the dsr style guide from being used in code chunks. This function tests a function for calls to forbidden functions and flags the offending lines.