Fabian Druschke c13f2477b1 Update README and manpage for v0.40: document AES-CTR, large I/O buffers, new I/O modes, BMB21 method, and improved device exclusion ...

This commit updates both README.md and the nwipe(8) manpage to reflect the
features and behaviour introduced in the upcoming v0.40 release. Changes include:

- Added documentation for the new AES-256-CTR PRNG and its hardware-accelerated
  implementation.
- Updated erasure method list to include the BMB21-2019 State Secrets Bureau
  sanitisation standard.
- Added full documentation for large, aligned I/O buffers and their impact on
  performance.
- Documented the new I/O mode system (`--io-mode=auto|direct|cached`,
  `--directio`, `--cachedio`) and the interaction with O_DIRECT fallback logic.
- Updated sync behaviour description to match the new byte-accurate scaling for
  cached I/O.
- Updated PRNG section to remove the “future release” note for AES-CTR.
- Documented improved device exclusion with `/dev/disk/by-id/*` support.
- Updated seeding description to reflect the use of `getrandom()` instead of
  `/dev/urandom`.
- Refreshed dependency lists and provided concise installation instructions for
  multiple Linux distributions.
- Minor stylistic cleanup, clarification of SSD limitations, and improved README
  structure for readability and accuracy.

2025-11-27 16:23:22 +01:00

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