Briefing.com Summary:*Signs of a healthier, more durable bull market have emerged to begin the year. *Stock market leadership reflects a pro-growth outlook. *Relative weakness among the mega-cap stocks is a matter of rotation, not deterioration, as earnings and economic fundamentals remain intact. There is an adage in the stock market that "as goes January, so goes the year." Well, so far, so good. We are a little more than...