Economics bugfixes for Answer Key and associated fixes

First round of fixes for upcoming Economics Text.  Fixes include changes for EOC sections (problems, etc), along with enhancements to References section.  Code added to Answer Key section to turn off numbering / captions for figures and tables.  Blockquote code also added for formatting/margins.  Fixes also included for non-bold index term, and removal of numbering for equations (precalculus only)