Rename default distribution to volto

[davisagli]

Fixes #161

The only tricky bit here is that the name of the distribution is stored persistently, so we need an upgrade step to update that reference.

[mister-roboto]

@davisagli thanks for creating this Pull Request and helping to improve Plone!

TL;DR: Finish pushing changes, pass all other checks, then paste a comment:

@jenkins-plone-org please run jobs

To ensure that these changes do not break other parts of Plone, the Plone test suite matrix needs to pass, but it takes 30-60 min. Other CI checks are usually much faster and the Plone Jenkins resources are limited, so when done pushing changes and all other checks pass either start all Jenkins PR jobs yourself, or simply add the comment above in this PR to start all the jobs automatically.

Happy hacking!

[stevepiercy]

Changes look good.

How can I actually test this PR? My guess is to run Cookieplone to generate a project, then make the same replacements you made here in the project. Before I spend time on that guess, I'd appreciate any guidance. Thank you!

[davisagli]

@stevepiercy No, this isn't a template for changes to make in a project. A Cookieplone project installs Plone, which depends on both plone.volto and plone.classicui, providing the 2 built-in distributions. This change won't be available in a cookieplone project until there's a new release including this change.

You have 2 options for testing:

1. In this repository, run make install, then make start, and open http://localhost:8080
2. Use buildout.coredev, make sure plone.volto is checked out from this branch, start the instance and open http://localhost:8080

[davisagli]

@jenkins-plone-org please run jobs