MRG: Add links for parameters

[larsoner]

WIP because it requires numpy/numpydoc#197, thus the weird pip install for now for CircleCI. Want to make sure it works before getting the NumpyDoc PR merged.

[agramfort]

can you give a link to a rendered doc to understand what this brings?

[codecov]

Codecov Report

Merging #5840 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #5840      +/-   ##
==========================================
+ Coverage   88.67%   88.69%   +0.01%     
==========================================
  Files         396      396              
  Lines       71805    71916     +111     
  Branches    12065    12084      +19     
==========================================
+ Hits        63675    63785     +110     
+ Misses       5201     5200       -1     
- Partials     2929     2931       +2

[larsoner]

Look at these wonderful parameter lists

https://10865-1301584-gh.circle-artifacts.com/0/dev/generated/mne.viz.plot_topomap.html

[agramfort]

wunderbar !

[larsoner]

Since this touches a lot of files and fixes a bunch of docstring errors, I'd like to merge this one. The only downside is that there will be some cruft in the conf.py until the numpydoc PR gets merged. If it never does, we can just delete the xref stuff from conf.py.

[agramfort]

you have my blessing. But does it mean it will get harder for people to build the doc?
do we have now install something more?

[larsoner]

No. Eventually, once the numpydoc PR is merged, this will take effect for us. If someone has an old numpydoc, it will still build, just without the links.

[agramfort]

awesome !

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