hammer mirror-copy from old hammer version to new hammer version screws up completely

["Simon 'corecode' Schubert" <corecode@xxxxxxxxxxxx>]

When performing a mirror-copy from an old hammer version to a new 
version, no directory contents appear.  the pfs is basically unusable, 
yet uses up disk space.

THIS IS EXTREMELY ANNOYING AND DANGEROUS.  WHY IS THIS STILL NOT FIXED?

This is a great opportunity to completely destroy all your data.  EXCELLENT!

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