Created destructive removeTrailingZeros() method on ZString.

ZString.cpp

@@ -544,7 +544,16 @@ namespace coreutils {
       return true;
    }
 
-
+   ZString ZString::removeTrailingZeros() {
+      if(length > 2) {	   
+	 while((*(data + length - 1)) == '0')
+	   --length;
+	 if(*(data + length - 1) == '.')
+	   --length;
+      }
+      return *this;
+   }
+   
    void ZString::nextChar() {
       if(!eod())
 	++cursor;