Ported convert_raw_quadratures.py to python 3.
Ported convert_raw_quadratures.py to python 3.

Signed-off-by: Klaus Zimmermann <ab9799f1d69cd0f0f44d0b70b03dad5dbfb4ddb9@ts.infn.it>

tomohowk/tomohowk,zklaus/tomohowk