Fixes for EOC numbering for Statistics with subsections and font size issue w/Stats Lab

When inserting subsection "Bringing it Together" into Practice / Homework problems sections, the subsection is not using the appropriate counter to keep numbering in sync.  Parent counter added to CSS element for subsection so that when this section is added, the subsection keeps numbering in sequence.

Also fixed a small font issue with figures when placed inside Stats Lab.  Figure is now regular size while Stats Lab subsection headers retain larger size per design template