Rebrand as Python (pyimagej)

[hinerm]

The app title becomes "(Fiji is just) PyImageJ" when starting in Python mode. I believe that calling this Python (scyjava) in the script language selection dilutes the branding and opens up more opportunities for confusion. I would vote for just sticking to PyImageJ, for the implicit recognition of "ImageJ"

[ctrueden]

I was hoping we could just rename it to "Python". And the other one to "Jython". No more parentheticals. What do you think?

One downside is that I'd also eventually like to have a Python-based script language built on Appose. So then the naming issue would reemerge...

[hinerm]

I like the Python/Jython split.