Syncthing on SQLite -- help test!

[Nummer378 (Max)]

Please see this post for a reasoning on why this is v2:

@calmh

However, I think we should release Syncthing-with-SQLite as Syncthing 2.0. The reason for this is more to do with deployment and building than it bringing amazing new user-facing features. To be clear, I do expect it to be more stable, more correct, and easier to debug, however I expect the rollout to be bumpy.

It’s a new way to build, with a new compiler in the mix. It’s an entirely new dependency for a critical part of the system. There’s a significant migration at startup, which takes up a significant amount of disk space and which can leave Syncthing in a bad state if it fails. We’ll probably break all the distribution packagers, and the Debian people will freak out about the bundled SQLite dependency and need ugly hacks to use dynamic linking to their packages etc.

All of this points to it not being a great idea to just roll it out to all users without saying anything, hence the 2.0. The new major version is significant in that the current auto upgrade code will not upgrade to it without prompting.