Proposal: make squash-merging the default behavior for gitlab MRs

[David Hurka]

> [...]
> I've been told that our Sysadmins have developed some tooling capable of
> checking the "Squash when merging" checkbox by default for new Merge
> Requests. [...]
> 
> I'd like to propose [squash-merge] as a sane default for new Merge
> Requests.
> 
> [...]
> Thoughts?

Yes, I would like that, it saves me one or two clicks per month. :)

Probably it will save additional one or two MRs per month that just repeat 
another MR that just misses this option enabled. Related to the this, is it 
possible to check the "Allow contributions" checkbox by default?