code: @Nonnull
    public static EChange setPropertyValue (@Nonnull final String sKey, final boolean bValue)
    {
      return setPropertyValue (sKey, Boolean.toString (bValue));
    }
docs: Set a system property value under consideration of an eventually present
  {@link SecurityManager}.
  
  @param sKey
  The key of the system property. May not be <code>null</code>.
  @param bValue
  The value of the system property.
  @return {@link EChange}