Announcing LTSP 22.01

Copied from https://github.com/ltsp/ltsp/issues/1#issuecomment-1019081703

As always, special thanks to Vagrant for uploading to Debian.

## Announcing LTSP 22.01

A new version LTSP 22.01 is available in the [proposed 
PPA](https://ltsp.org/advanced/proposed-ppa/). Please test and verify 
that it doesn't cause any issues for you, as it will be uploaded in the 
[stable PPA](https://ltsp.org/docs/ppa/) and in [Debian 
testing](https://packages.debian.org/testing/ltsp) in a few days.

Changelog from the previous version:

   * Use cp -u to inject ltsp (#636)
   * Prefer go-md2man or pandoc over ronn for man pages (#635, #640)
   * Use more compatible markdown (#634)
   * Introduce DISABLE_SYSTEM_SERVICES (#495)
   * debian/watch: Use tags to scan for new upstream versions
   * Suggest single partitions for VMs (#618)
   * Implement ltsp remoteapps (#597)
   * Avoid creating /srv/ltsp/raspios/boot/overlays/overlays (#594)
   * Check if iPXE has the features we need (#579)
   * Add e4:5f:01 rpi OUI in dnsmasq and ltsp.conf (#498)
   * Implement multiseat autodetection (#133)
   * Use correct root hash in ltsp.conf.5.md (#547)
   * Correctly replace BASE_DIR in ltsp.ipxe (#416)
   * Don't hardcode LTSP paths in 25-ro-root.sh (#485)
   * Use the system hostname (#568)
   * Use DNS=1 on ltsp clients (#373)
   * Introduce undocumented ltsp session
   * Add PATH and username for CRONTAB_x (#454)
   * Check if sssd.conf exists (#450)


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