* ikernel update and ipython updates. Note that these packages go together so they in one PR request.
Note that python-prompt-toolkit has to be split into 2 packages because ipython 7.1.1 for python3 now requires to prompt_toolkit > 2.0 which is only available for python3. The old version of prompt_toolkit for python2 is now separate so that th eolder version can be provided for ipython 5.x for python2.
* Fixes suggested by Alex puck and a few things I found
1) Delete python-ipykernel and make a separate python2-ipykernel package that only installs for Python2.
2) In python3-ipykernel - add license file and fixup dependencies for Python3 only package. Remove unused stuff.
3) python3-ipytho - add an optional dependency on python3-ipython-ipyparallel. That is something I'm working on now which was suggested by setup.py file in this package.
* various fixes to packages
python2-ipython - make it conform to standard pattern
python2-prompt_toolkit - add --skip-build, it's built separate
python3-ipykernel - formatting
python3-ipython - clarified dependencies and add tests
python3-prompt_toolkit - add mingw-w64 to description
python-python-simplegeneric - make comply to standard pattern
