• Add CLI options --index-file and --index-folder to specify an index location or folder.
• Add support for zstd compressed TARs.
• Add support for xz compressed TARs when compressed with pixz or pxz or similar tools
  limiting the block size.
• Fix index location check not accounting for SQLite special requirements.
• Add warnings for when the existing index was created with different arguments,
  e.g., without --recursive, even though --recursive was requested.
• Add specialized exceptions used by ratarmount.
• Add recursive mounting for folders in order to mount all contained TARs.