Fix issues with the libxo'ing of /bin/ls

[allanjude]

Summary

• Add whitespace trimming to some fields (username, group, size, inode, blocks) to avoid whitespace in JSON strings
• fix -m mode, was invalid JSON (repeated keys), and was missing outer array container
• in -n mode, numeric uids and gids were returned as strings

[allanjude]

Update diff

[allanjude]

Undo last change.