Simplify AD integration?

[Stephan Mueller]

Eric Blake writes:
" How bad would it be to treat the window's DOMAIN\user as cygwin
" user@DOMAIN?  Yes, it means string-splicing to rearrange strings when
" converting between the two forms, rather than just single-character
" replacement, but it might work.

Sounds reasonable to me.  Consider also that modern(*) Windows
recognizes (prefers?) user@domain as equivalent to domain\user in
places.  For example, when I log on, I can use either form in the user/
password dialog.

stephan();

(*) I use Windows 7 and 8