New version of aixutil.py

++ Changes ++
* more comments
* re-worked the 'searches' for matches after adding changing the way
the output from _get_dumpH was read (now to an array using readlines).
Also, p.stdout.close() and p.wait() are done within the _get_dumpH routine.

Suggestions on how to have cleaner workings with the 'arrays of text' and searching through them is welcomed! It is passing the internal tests is all I will say for now.