Add the ability to run puffs in userspace. This means that puffs
can now be developed in userspace using puffs for development
(I hate emulators, they are annoyingly clumsy).

To e.g. mount psshfs u

Add the ability to run puffs in userspace. This means that puffs
can now be developed in userspace using puffs for development
(I hate emulators, they are annoyingly clumsy).

To e.g. mount psshfs using puffs-on-puffs, run fs/bin/syspuffs/syspuffs
with the regular mount_psshfs command line as an argument:

golem> ./syspuffs /usr/sbin/mount_psshfs ftp.netbsd.org:/pub /puffs

This will make the mount appear as usual, with the exception that the
requests will be passed through puffs both in the kernel and userspace:

ftp.netbsd.org:/pub on /puffs type puffs|p2k|puffs|psshfs

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