Plugin name collisions

First off thanks so much for your awesome work on Intake!

Today I’ve been developing an Intake Plugin for Iris and noticed that if I create a netcdf plugin it collides with the xarray plugin and Intake only loads one of them at import time.

Luckily for my testing iris comes before xarray alphabetically so I have been able to test my plugin without removing the xarray one.

Given that both iris and xarray can open netcdf datasets I think this choice should probably be down to the user as to which one they want it to be loaded with. It would be great to update intake to be able to load multiple plugins for the same datatype and then allow the user to pass a kwarg somewhere to specify which one they want to use at a particular moment.

[martindurant]

Feel free to add PRs to change https://intake.readthedocs.io/en/latest/plugin-directory.html as you bring them up. Also, your install instructions probably also need -c intake, at least until intake packages migrate to conda-forge and/or main.

[martindurant]

Thank you for making intake-iris!