[Feature]: Add include-parent-in-path parameter

[forsyth2]

How will this affect the next version number?

New feature (increment MINOR version)

Is your feature request related to a problem?

@TonyB9000 ran into this issue: if someone were to “zstash extract” any two archives in the same PWD, the extracted files would clobber one another – because while they are distinguished by archive-NAME, they are not distinguished by archive-PATH within the archive.

Describe the solution you'd like

@TonyB9000's suggestion: a special zstash flag “—include-parent-in-path”, so that if hist-BCRC were the target directory, the archived file paths would begin with that value (especially if “—cache ” is supplied). That would require zstash to “cd” up one directory and prefix the target basename to every supplied pattern.

Describe alternatives you've considered

No response

Additional context

No response