[development] _drupal_wrap_mail_line()

[Daniel F. Kudwien]

> Drupal sends plain-text emails by default. Plain text mails 
> should (in my opinion) be wrapped to 80 lines. If you want to 
> send html-mail you need to use some contributed module. That 
> module can undo the wrapping of the text for the html mails, 
> if desired.

Exactly for that reason, only the default plain-text mail implementation in
Drupal 7 wraps the text.  Contributed modules that are sending HTML messages
can easily skip this entire step now.  One more giant YAY! for Drupal 7!

sun