DETAB-Z replaces ASCII tabs in text files with the correct number 
of spaces.  No other characters are affected: control characters 
are not removed, high-bits are not reset.  Under ZSDOS create 
file stamps are preserved.  Version 1.4 is much faster, optimizes 
some of the code, and corrects a couple of bugs from previous 
versions.  For ZCPR3 only.