Improved testbuzz utility.
Improved testbuzz utility.

- it accepts --trace to show the stack trace during the execution
- implements the function 'print' to make testing/debugging easier

naturalmechanics/Buzz,erikarn/Buzz,NESTLab/Buzz,erikarn/Buzz,chavolla/Buzz,MISTLab/Buzz,MISTLab/Buzz,naturalmechanics/Buzz,chavolla/Buzz,chavolla/Buzz,erikarn/Buzz,NESTLab/Buzz,naturalmechanics/Buzz,NESTLab/Buzz,MISTLab/Buzz