Hello World!

Changes are:

• support functions with no parameters or parameters on several lines

See example:

pydef py_hello():
    "hello world"
    return ("Hello, World !");

pydef py_power(x,
               y):
    "power function : example loading module, handling input/output as strings"
    import math as py_math
    return ("%s" %  ((x*1) ** (y*1)) );