6.x

Improved repository creation screen and help text.
Implemented a new API function bitcache_uri_to_id().
Improved Bitcache_Stream::mime_type() for better MIME type detection robustness.
#279239: Download/view links don't work by memfis: Implemented support for HTTP requests using non-clean URLs in the HTTP endpoint.
Always use bitcache_resolve_id() to construct bitstream URLs in order to consistently support non-clean URLs.
Implemented a new API function bitcache_get_modules().
Expanded the bitcache_get_modules() API function to support 'info' and 'titles' operations in addition to returning module names.
Implemented a table on the configuration screen displaying the currently installed modules supporting the Bitcache API.
Implemented target repository selection on the upload/fetch administration screens.
#336715: Amazon S3 storage adapter: Implemented a new API function bitcache_link(), enabling better opportunities for encapsulating the storage location for e.g. Amazon S3 backends.
Fixed an error in bitcache_get_modules() when no modules implementing the Bitcache API are installed.
#338506: Caching of image resources?: Implemented more useful Cache-Control headers to override the Drupal default headers and allow bitstreams to be cached by private caches.
#282164: Multi-tier repository structure by sonnen: Implemented support for multi-tier directory storage structures.
Fixed disk utilization totals calculation in Bitcache_FilesystemRepository::size().

Known issues:

#341654: "Unsupported operand" error on installing Bitcache

Note: This is experimental software meant for advanced users; assume nothing works, and you may be pleasantly surprised. And when it breaks, you get to keep both pieces.