ratarmount

Fixes

Fix AttributeError: module 'fuse' has no attribute 'errno'.
Fix --commit-overlay, which did not add newly created empty folders to TARs.
Do not ask for confirmation if there is nothing to commit when using --commit-overlay.
Improve unmounting with ratarmount -u, especially with the AppImage.

Properly close opened file objects in mount sources.
Fix --disable-union-mount, which returned an I/O error.
Fix that --use-backend=indexed_gzip still did use rapidgzip. It only worked when both were specified.
Fix detection of self-extracting RAR files.
Improve the error message when a file cannot be read because of a missing dependency.
Improve debug message when the index does not yet contain a gzip index.
Fix faulty seek forward for files opened via RarMountSource when whence is not io.SEEK_SET.

Skip data offset collection for zip files because it takes too long and is unused.