A bit more cleanup, especially within the nfr*Demo.py scripts. Both are now updated to use a nice argument parser (which may accept more arguments later).

However, while tidying up the look of the figures, I noticed a mismatch between
nfrVrH and the histogram. The shape seems perfect, but the normalization of the
nfrVrH function is not one. I would say that it is not even close, since it is
~0.93. Thus, I had better derive more exactly the formula, or check the precision
of my integration operators A_V and A_H.

Changes to be committed:
modified: debinningCore/__init__.py
modified: examples/nfrDemo.py
modified: examples/nfrVrHDemo.py
modified: logo/logoGen.py