function fillLine( line, fill, left, right ) {
	var out;
	var i;

	out = '';
	for ( i = 0; i < left; i++ ) {
		out += fill;
	}
	out += line;
	for ( i = 0; i < right; i++ ) {
		out += fill;
	}
	return out;
}
Fills a slide line.

@private
@param {string} line - line text
@param {string} fill - fill character
@param {NonNegativeInteger} left - number of characters to fill left (left "padding")
@param {NonNegativeInteger} right - number of characters to fill right (right "padding")
@returns {string} filled line