borgmatic 1.5.5

• #314: Fix regression in support for PostgreSQL's "directory" dump format. Unlike other dump
  formats, the "directory" dump format does not stream directly to/from Borg.
• #315: Fix enabled database hooks to implicitly set one_file_system configuration option to true.
  This prevents Borg from reading devices like /dev/zero and hanging.
• #316: Fix hang when streaming a database dump to Borg with implicit duplicate source directories
  by deduplicating them first.
• #319: Fix error message when there are no MySQL databases to dump for "all" databases.
• Improve documentation around the installation process. Specifically, making borgmatic commands
  runnable via the system PATH and offering a global install option.