ITERATOR-REMOVE-VALUE!, *-DELETE!

[Taylor Campbell <campbell@xxxxxxxxxxxx>]

The REMOVE in the middle of a function name has by convention in past 
SRFIs
indicated a predicate argument, while DELETE indicates a simple value 
deletion.
This, I believe, should be reflected in ITERATOR-REMOVE-VALUE!, as it 
already is
reflected in *-DELETE!.  I therefore propose to change it to
ITERATOR-DELETE-VALUE!.