To avoid confusion, we now use 'subnet' to talk about a subnet
represented with the CIDR notation, such as 10.0.0.0/8.
In in that case:
- 10.0.0.0/8 is a 'subnet'
- 10.0.0.0 is the 'prefix'
- 8 is the 'prefix length', or by extension the 'subnet length'
Use these words everywhere in the code and documentation for clarity.
Replace --sftp --scpup --scpdown by --protocol PROTOCOL.
Also take the opportunity to replace --user-any by --user * and --port-any by --port *.
All the legacy options are still supported but are now undocumented.
widest_v4_prefix (maximum allowed prefix to add in a single ACL),
and self_remote_user_only (only allow ACLs where the remote user
is the same than the bastion account name)