Update copyright notices to 2017

 1.6.2-35: Update Changes.txt, increment patch level

1.6.2-33: Update Changes.txt, increment patch level

1.6.2-32: Update Changes.txt, increment patch level

1.6.2-30: Update Changes.txt, increment patch level

1.6.2-29: cache_fun now supports caching of operator models.

1.6.2-27: Update Changes.txt, increment patch level

1.6.2-26: Update Changes.txt, increment patch level

1.6.2-25: Update Changes.txt, increment patch level

1.6.2-24: Update Changes.txt, increment patch level