Answer key converted to single column and chapter review header added as boilerplate

For this set of hot fixes, The Answer Key for the PreCalculus text was converted to be in (1) one column and not inline due to the fact that some answers will be cartesians graphs (art).  Not a good experience to be inline.  Also W&N decision was implemented to place "Chapter (X) Header" above the Key Terms collation in eoc chapter sections.  Boilerplate paragraph in addition to this is not possible.