Modified nextChar method to return character under cursor before incrementing cursor.

ZString.h

@@ -419,10 +419,11 @@ namespace coreutils {
       bool ifCRLF();
 
       ///
-      ///
+      /// Returns the character at the cursor and advances the cursor one
+      /// position until end of data.
       ///
       
-      void nextChar();
+      char nextChar();
 
       ///
       ///