Set the default values. The values are
Glyph for the \r char
Glyph for the diff begin indicator
Glyph that marks deleted text in diff
Glyph for the diff end indicator
Glyph that marks an inserted text in diff
Glyph for the \n char
Glyph for the \0 char
Glyph that indicates the error line
Glyph that sepparates the line number
Glyph for the space char
Glyph for the tab char
Glyphs used to display special chars in the results