Changes

=== Bugfixes ===

=== Bugfixes ===

* Switch criu-ns from unversioned 'python' to 'python3' for easier distribution packaging

* Switch [[CR_in_namespace|criu-ns helper script]] from unversioned 'python' to 'python3' for easier distribution packaging

=== Improvements ===

=== Improvements ===

* Add '--join-ns' interface to libcriu to allow joining namespaces via libcriu like CLI and RPC already allow

* Add '--join-ns' interface to libcriu to allow joining namespaces via libcriu like CLI and RPC already allow