Konstancja Satalecka / ctools

Add two variables PYTHON_OPEN and PYTHON_CLOSE that are either " " and "" (for Python 2) or "(" and ")" (for Python 3). These variables are used in setup.py to toggle between the Python 2 print statement and the Python 3 print function.

… compiles also correctly on compilers that differ from gcc.

… and GammaLib in separate locations)