DETROIT - The Detroit Lions have reportedly agreed to a contract extension with head coach Jim Schwartz.  DetroitLions.com cites a source as saying the two sides have agreed to a multi-year pact, but the length of the deal and financial terms are unknown.  The 46-year-old has taken the Lions from an 0-and-16 team to a 10-and-6 playoff participant in just three seasons.  Schwartz was set to enter the final year of a four-year contract he signed prior to the 2009 season.