Make it packageable/executable

[erwanp]

This fork installs in one-line as a Python package. However, it does does not include packaged/executable files.
Therefore you will need a Python environment installed (Anaconda or any scientific distribution is recommended).
For this reason it was never merged in Aluque's original version. See aluque#5

If you want to contribute to the Community development of QtPlaskin, and make the new changes available for all,
we definitly need some development help on making the new fork packaged/executable. Afterwards we would be able
to merge it.