    Additional text with special characters
    A special character is generated by a sequence of 2 characters.
     [d         diameter sign
     [g         degree sign (angle)
     [+         + - Signs
     ['         double quote (")
     [/         Superscript
     [\         Subscript
     [n         new line (return, CR)
     [%         Is replaced by the standard text. If the text does not include [%,
            the default text provided throughout is inserted.
     [-         no standard text.
     [[         a square bracket "["
     [0 to [9   only N=DIM3 and N=LDRP: Number of decimal places of the dimensions
             (must be at the beginning of the text block)
     [V20]      to expand a numeric variable (V20 in the example)

    Example:
    “[+ 0.2 "

    Dimension arrows
    are defined by specifying a number with 2 digits;
    one digit for each of the two dimension arrows;
    No indication or -1: create both arrows automatically.

     0        no dimension arrow;
     1   <    left arrow
     2   >    right arrow
     3   /    slash
     4   > <  arrow right and arrow left

    Example:
    "12"   left arrow  and right arrow

    Extension lines
    are defined by specifying a number with 2 digits;
    one digit for each of the two extension lines;
     0 = no guide,
     1 = line
    Default is 11 (two lines)