[qren] automatically add script dir to @INC
[qren] automatically add script dir to @INC

This change updates qren to automatically add the script directory to
@INC, the perl include directories. This frees the user from needing
to pass the script directory as -Idir and simplifies qren usage.

ai7/toolbox,ai7/toolbox,ai7/toolbox,ai7/toolbox,ai7/toolbox