Feature Pulled

- Removed the feature that allows commands to be piped in to stdin,
  and appended to any existing command line.  This feature is
  conditionally compiled, controlled by the FEATURE_STDIN define in
  main.h
- Many unit tests contained "echo '-- y'", and now use "echo 'y'"
  because the '--' is no longer supported on stdin.
- Thanks to the IRC team for testing, including Bryce Harrington,
  Sam Stuck, Owen Clarke, Greg Grossmeier.

src/main.h

@@ -30,6 +30,7 @@
 #define L10N                                           // Localization complete.
 
 #define FEATURE_COLOR  1                               // Enable color.
+//#define FEATURE_STDIN  1                             // Enable reading stdin.
 
 #include <string>
 #include <vector>