* Fixups for jupyter

This PR fixes a few things for some jupyter related packages.

py-ipython:
- make the python depends_on statements reflect needs of different
  versions
- remove an unneeded conflicts directive

py-ipywidgets:
- add new version
- set version constraints for py-widgetsnbextension

py-jupyter-console
- add new version
- set python dependencies for versions as needed
- set version constraint for py-ipython
- set version constraints for py-prompt-toolkit

py-pyqt5
- build with py-sip

py-qtconsole
- add dependency on py-pyqt5

* Update var/spack/repos/builtin/packages/py-jupyter-console/package.py

Tweak version ranges.

Co-Authored-By: Adam J. Stewart <ajstewart426@gmail.com>

* Update var/spack/repos/builtin/packages/py-jupyter-console/package.py

Tweak version range.

Co-Authored-By: Adam J. Stewart <ajstewart426@gmail.com>

* Make py-pyqt5 a run dependency

Also, make formatting more consistent.

* Fix site_packages_dir

Change reference of site_packages_dir to self.site_packages_dir. Oddly,
this did not show up as a problem until I regenerated the module.

* Restore py-pyqt5 to previous state

* Explicitly set path to site_packages_dir

This change prevents an error when regenerating the py-pyqt5 module
file.

* Fix flake8 errors

* Make sure prefix is in join_path

* Fix flake8 errors

Co-authored-by: Adam J. Stewart <ajstewart426@gmail.com>