Log Message:
Update tarsnap to 1.0.37.

First the new release: Tarsnap 1.0.37 is now available.  This version brings
the following substantive changes compared to tarsnap 1.0.36:

 * tarsnap-key(gen|mgmt|regen) now accept a --passphrase-time option,
which specifies the duration to be spent on computing the derived keys
used for encrypting the tarsnap key file.

 * tarsnap now accepts a --keep-going option when deleting or printing
statistics about multiple archives.

 * tarsnap-keymgmt now accepts a --print-key-permissions option for
listing the permissions contained in a key file.

 * tarsnap --print-stats now accepts a --csv-file option for printing
statistics in comma-separated-value format.

 * tarsnap now accepts a --verify-config command which exits silently
after checking the configuration file(s) for syntax errors.

 * tarsnap now looks for a server named "v1-0-0-server.tarsnap.com"
instead of the historic "betatest-server.tarsnap.com" hostname.  This
should have no user-visible effect in most configurations.

 * tarsnap now correctly warns if a sparse extract fails due to hardlinks.

 * tarsnap now prints a warning if creating an empty archive.

As usual, there are also many minor build fixes, harmless bug fixes, and code
refactoring / cleanup changes.  For a full listing of changes, consult the
tarsnap git repository: https://github.com/Tarsnap/tarsnap