Economics bugfixes for Final QA

Bugfixes for TOC styling, numerous headers (font, color), creating answer key solutions to be inline, along with various other fixes to spacing.  Fixes for Attributions, References and Key terms headers. Removal of colon for Key terms.

This changeset also takes care of regressions introduced by the utilization of the /refactor branch (precalculus-skeleton, precalculus-slots, base-skeleton/slots, etc)  In many instances, due to expediency, the higher specificity problems coming from precalc have been fixed in economics.less for now.  Later will will refactor economics.less into skeletons/slots and broom up these overrides.