One-char README update.
LTS-165 - Foreigner, and a number of fixes and additional paranoid models required by same.

The reason for inspiring fear in the additional models, in addition to the benefits of soft delete, is that it turns out that
anything north of a paranoid model in the hierarchy of models that has :dependent => :destroy over that paranoid model
 ALSO needs to be paranoid, or else unpleasantness arises when you try to delete something higher up the chain, and its
dependents soft-delete, and the foreign key constraint prevents soft-deletion and rolls the whole thing back.
Added details of paranoia-related model hierarchy constraints to DEV_NOTES.md