Version 1.22.0

• Add support for virtual memory files for vmcores
• Add option to restart an existing task in retrace-server-task and on task manager page
• Disallow users other than retrace to call retrace-server-worker
• Improve error message in case of Kerberos authentication failure
• Revamp task manager web UI
• Revamp GPG verification of package signatures; use keys from distribution-gpg-keys
• Accommodate for multiple debug directories in Fedora 27 and later
• Fix FTP submissions on task manager page
• Fix permissions on dmesg file in task results directory
• Migrate build process to Meson; completely drop Autotools
• Add Tito configuration
• Update translations
• Drop python3-six dependency
• Add build dependencies on gzip, lsof, tar and xz
• Rewrite Dockerfile
• Migrate to calling subprocess.run() in place of s.Popen() and s.call()
• Use pathlib.Path instead of strings and os.path methods in some places
• Add kernel-only config options KernelDebuggerPath and RetraceEnvironment=native
• Introduce type annotations
• Address issues reported by Pylint
• Other minor code refactoring and cleanup operations