Revert "Corrections to spelling and grammatical errors."

Revert "Corrections to spelling and grammatical errors."

This reverts commit 5bf4b3bf13bc4055684a48448b05920845ef7764.

On p5p-list, Steve Hay wrote on 2015-01-29:

"... these and other changes to Tie-File could break backwards compatibility.
The keys of %opt are passed in from user code, so we can't change the expected
key from "autodefer_threshhold" to "autodefer_threshold" without also asking
users to change their code, which is probably more hassle than it's worth."

Parts of the reverted commit will be re-committed from a new patch.