Remove call of install_nbextension

[vinklein]

As jdemeyer stated in pari_jupyter PR5
install_nbextension seems to be buggy (on some config it try to install file under /usr/local/share/jupyter even with pip install --user option)
see (jupyter/notebook#1706).

• Remove the call of install_nbextension
• Use data_files instead with fixed path (old paths where wrongs)

[sebasguts]

Thank you :)

[vinklein]

You're welcome.

Jdemeyer has also remove enable_extension() as explained in the end of pari_jupyter PR5.

In short it allows the extension to be auto enabled with Jupyter notebook version >= 5.3.
The drawback is that with previous version the extension must be manually enabled (with a command).

If you want to i can port this evolution to "jupyter_kernel_singular". Just tell me.
I think it would be nice to have the same behaviour accross ODK kernels.

[sebasguts]

Thank you, but I already did this :). I still have to update the readme, though.

[vinklein]

Oh nice !