[#62789470] defaults for node/citation ids in networks.citations.

also some first steps on tutorials
[#62785902] added tutorial for getting, parsing wos data
Merge branch 'erick' into python
[#62802038] reorganized networks

* renamed networks.citations to networks.papers
* moved author_coupling to networks.papers
* moved author_cocitation to networks.papers
* updated test cases
* updated scripts
[#62798524] started on networks tutorials
Merge branch 'erick' into python
Merge branch 'python' of https://github.com/diging/tethne into python