Fix for answer key meaning misalignment when 3 sentences present

Added constraining height to dt container for glossary to stop it from causing paragraph wrapping issues with meaning.  When three or more lines are present, current solution fails with wrapping appropriately.  With this solution in addition to one in place, Key terms should be able to handle many lines of definitions if needed

Additional changes to economics.css / precalculus.css are just the removal of the section title code.  I think the CSS files weren't added to master previously.