Release 3.26

This release brings several important fixes for cgroups v2 and all users on systems with cgroups v2 are strongly recommended to upgrade.

• Fix regression from BenchExec 3.25 for detecting memory-limit violations of a run.
  The changes related to the LXCFS integration in the last version caused the problem that a run that hit the memory limit was no longer marked as "out of memory" but as "failed" and did not have any measurement results (only for cgroups v2 and with container mode enabled).
  Note that the memory limit was still correctly working and also measurements produced for non-failed runs were correct.
• Fix AssertionError when creating a systemd scope for cgroups v2 usage.
  This was caused by a race condition and did occur only with a certain probability depending on the system load.
• Fix warning about left-over cgroup during run cleanup for cgroups v2.
• More robust cleanup of cgroups created by the benchmarked process.
• Fix installation of our Python package on Windows.
• Several new and improved tool-info modules.