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 CENTER()
 Centers a string using pad characters
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 Syntax

     CENTER(<cString>,[<nLength>],[<cPadCharacter>],
        [<lMode>]) --> cString

 Arguments

     <cString>  Designates the character string that you choose to
     center.

     <nLength>  Designates the length of the line within which the
     <cString> sequence is centered.

     <cPadCharacter>  Designates the character with which the <cString>
     sequence is centered.  The default character is a space.

     <lMode>  Designates whether only the beginning, or both sides of
     <cString> are padded.  The default value (.F.) only fills the beginning.

 Returns

     The processed string is returned.

 Description

     The CENTER() function provides a simple way to center text in any line.
     CENTER() is able to pad only on the left or on the left and right using
     any selected character.  Leading and trailing blanks (if any) are
     replaced with the new character.

     When <nLength> is not specified, CENTER() assumes the maximum available
     line width to be MAXCOL() + 1, so that the correct output appears in the
     windows.  Additionally, the current cursor position or the column
     position selected through a SAY command is also noted.  So, if there is
     an output on an 80-column line that begins at column 20, a section of 40
     characters from column 20 is used to center the output.

 Note

     .  If the sum of the pad characters is odd, then one more
        character is inserted at the beginning of the character string.

 Examples

     .  Center the output with an available line length of 10, and
        insert the leading characters:

        ? CENTER("xx", 10)                     // "    xx"

     .  Fill on the left and on the right:

        ? CENTER("xx", 10, .T.)                // "    xx    "

     .  When characters that match the <cPadCharacter> are present,
        these characters are removed prior to centering:

        ? CENTER("xx     ", 10, .T.)           // "    xx    "

     .  Fill with other characters:

        ? CENTER("xx", 10, ".")                // "....xx"
        ? CENTER("xx", 10, ".", .T.)           // "....xx...."
        ? CENTER("x", 10, ".", .T.)            // ".....x...."

     .  In the following example, the "X" is intended to represent a
        40-character wide screen.  The string "CLIPPER" is centered there
        with the "." character, starting at position 10:

        @@ 1, 10 SAY CENTER("CLIPPER", ".", .T.)

        XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
        XXXXXXXXX.......CLIPPER......XXXXXXXXX
        XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX