v6 as master, feature freeze of v5

[angularsen]

@lipchev I'm thinking we should make v6 our master branch now. Thoughts?

Mainly to get new pull requests and discussions for the v6 code base and not v5. Also to get more momentum on stabilizing and finalizing v6 so we can ship it.

Units can still be backported to a maintenance/v5 branch.

[lipchev]

Yeah, sorry it's been a busy week- I had a lot of things planned as a follow-up to #1507 but haven't gotten around to it... (when I do, there will be tons of momentum 😃 )

Making release/v6 the default branch would make it a little easier to contribute (that damn Sync feature would finally work directly from the web-interface).

I don't know if there are any gotchas- you're the git expert..

[angularsen]

Closed by #1536