Directly to finalfusion

The most important change in this release is that finalfrontier stores trained embeddings in the finalfusion format, which is implemented by rust2vec and finalfusion-python. This format is more generic than the old finalfrontier format and easier to implement readers for.

As a result of these changes, finalfrontier is now only for training embeddings. To actually use the embeddings in your own program, use rust2vec.

Summary of changes since v0.2.0:

• Store trained embeddings in finalfusion format.
• Remove ff-similarity, ff-convert, and ff-compute-accuracy. This functionality is provided by rust2vec.