v0.9.4-beta.5 — bugfix release

Bugfix release: faster restores.

Fixed

• Restores and occ backup:verify --deep fetched every blob with its own request, so on a
  remote location they ran far below the speed of the connection. The blobs of a pack are now
  read from one open stream, in the order they were written. Restoring 86 MB in 202 files from a
  Hetzner Storage Box over SMB went from 0.78 MB/s to 4.2 MB/s, the speed of reading the packs
  as plain files over that connection.
• Reading from an SFTP location waited a full round trip for every 256 KiB, whatever the line
  speed. Reads now keep up to 8 requests in flight. Restoring 1.97 GB in 500 files from a Hetzner
  Storage Box (47 ms away) took 694 s before the fix above, 499 s with it and 142 s with both
  (2.8 → 3.9 → 13.9 MB/s); a full 51 GB restore ran at 13.0 MB/s. When a server error
  interrupts such a read, it goes on from the same position with Nextcloud's own SFTP stream;
  after three failing files in a row, or on a Nextcloud whose SFTP library lacks what this needs,
  only Nextcloud's own stream is used.
• README: a WebDAV location on a slow upload needs a higher davstorage.request_timeout.

Package

ng_backup-0.9.4.tar.gz is the signed app store package (code-signed with the Nextcloud certificate for ng_backup); .sig is its app store signature.