pinto fsck

[schwern]

Since I've twice now screwed up the repository by copying it around, see #51, perhaps a pinto fsck would be useful.

Right now I can think of a few things it could do...

• Ensure all the tarballs which are in the index exist on the filesystem
• Recheck their checksums
• Ensure all the symlinks are symlinks

[thaljef]

I see that as an extension of the current verify command.

• Rechecking the checksums is on the TODO.
• Verifying the symlinks is a neat idea. Will add that too.

[schwern]

Yep, adding features to verify makes sense.