v3.3.4

Changes:

• Rework the sist2-admin UX (#389)
• Rework the sist2 index schema, should improve performance for larger datasets
• Implement support for embeddings search (using OpenBLAS for SQLite, and the new KNN query for Elasticsearch)
• Completely rework user scripts (See scripting.md). Uses Python instead of Elasticsearch's "painless" language.

Bug fixes:

• Fix error with incremental search (#406)
• Fix sist2-admin issue when scan fails (#415)
• Fix path error when scanning the entire disk (/) (#426)
• Fix problem where thread pool would not terminate (#416, #397, #399)
• Fix "Do not verify SSL connections to Elasticsearch" (#420)