fix(backend): try another node when missing files or crashed start

* Also request to re-prepare failed base
* make sure no duplicate set base
* refactor(frontend): set base status soon so users get their feedback. Reported by @gloriarodriguez
* refactor(frontend): Allow unset base with clones requested by @gloriarodriguez
* fix(backend): add indexes and cleanup db
* refactor(backend): properly start temporary domains

closes issue #1264