function alignFlushLeft( width, line, len, fill ) {
	var right = width - len;
	return fillLine( line, fill, 0, right );
}
Aligns a line of slide text against the left margin.

@private
@param {PositiveInteger} width - slide width
@param {string} line - line text
@param {NonNegativeInteger} len - effective line length
@param {string} fill - fill character
@returns {string} aligned text