Upgrading to full-text on existing project crashes

[dcporter]

Any existing project that takes the new full-text search update (#414) crashes because table exports_full_text_search_index was never created — the database looked initialized, so the whole setup phase was skipped. That makes this a breaking change, though I assume/hope it's pretty easy to check for that table specifically?

[trotzig]

Ah, great catch! I'll just bump the cache db filename before the release, that will "invalidate" (abandon) the old cache and create a new.