Dramatically improved coprocess handling.

Such improvements are an edifice-in-process, rendering the codebase
momentarily... well, harebrained. Since committing fragile, thoroughly broken
code appeared the only dutiful thing to do, we blithely return to your broken
codebase.

"Help, help!
   squealed the elocutionary doormouse.

 Nay, nay!
   brayed the cute (but otherwise cautionary) Kea.

 Die, die!
   mewled the expeditionary kitten, slyly.

 Now, now!
   howled the exsanguine human, sagely.

 – Except to say,
           today!"