correct offset for SxS when loaded via ajax
offset full content of breakaway for scroll
improved spacing for SxS
Fix issue with diff url for individual paragraphs within chrome
Add intro interps to toc structure
SectionUrl points to the correct url for interp intros
Chrome-based paragraphs use the same template as sections; build the tree around the one paragraph in view
Intro interp header has title as sub_label so it looks like the rest of the TOC entries
PEP8
Merge pull request #554 from cmc333333/interp-intro

Display intros to interpretations
Merge pull request #553 from ascott1/sxs-header

Fix ajax loaded SxS styles