anchor.diff:  
   rem -----1---------2---------3---------4---------5---------6---------7-------*
   
  +rem 0.0.16 2016-11-24-10:45 Report VCINSTALLDIR of the set environment
  +rem        aiding trouble-shooting of success and of error cases.
   rem 0.0.15 2016-11-22-09:05 Touch-ups, smoothing connections to other material
   rem 0.0.14 2016-11-20-13:41 Complete annotations.  Re-order checking for
   rem        a previous setup, whether simple repetition or conflicting.
  
positive.code: ECHO:          *** FAIL: VC ENVIRONMENT ALREADY SET BY OTHER MEANS ***  
  ECHO:          The environment is already set for compiling with a  %VCterse%
  ECHO:          VC++ compiler version %VisualStudioVersion%          %VCterse%
  GOTO :NOMIXING
  
  :FAIL3
  ECHO:          *** FAIL: VCBIND ENVIRONMENT HAS BEEN ALTERED ***
  ECHO:          Binding to VC++ %VisualStudioVersion% is changed     %VCterse%
  ECHO:          from version %VCboundVer% set by VCbind.  Continuing %VCterse%
  ECHO:          this session may lead to unexpected results.         %VCterse%
  GOTO :NOMIXING
  
  :FAIL2
  
negative.code: @echo off
  rem VCbind.zip\VCbind.bat 0.0.16     UTF-8                          2016-11-24 
  rem -----1---------2---------3---------4---------5---------6---------7-------*
  
  rem                  SETTING VC++ COMMAND-SHELL ENVIRONMENT
  