Moved the old school result hash conversion method to the result object
and made it publicly accessible (please forgive me).
Merge pull request #359 from colinnewell/colin/legacy_hash

Moved the old school result hash conversion method to the result object and made it publicly accessible.

Necessary for code which did `$tb->details->[-1]` and can now use `$tb->history->last_result->legacy_hash` but still wants to work with the hash structure.