Ahaggar: add comments to the __init__.py module

Signed-off-by: Djalal Harouni <tixxdz@opendz.org>
Ahaggar: move arguments from run() to the __init__()

Signed-off-by: Djalal Harouni <tixxdz@opendz.org>
Ahaggar: fncalls.py module add more helpers

* standarize_calls() parse fncalls and store return them in a list
* next_is_subcall: check if the next argument is a function call

Signed-off-by: Djalal Harouni <tixxdz@opendz.org>