Add more info to Tax disc and SORN tables
Fix issue when tabs and more info both displayed

The visualisation element doesn't have enough height when tabs and
"more info" are displayed with a double-decker graph, which means
the blue bar from the top of the more info is displayed in an
odd place.
Move more info on service availability sections

This needs to be on the module level rather than on the tab level.
Merge pull request #336 from alphagov/more-info-tax-disc-sorn

Fix several missing more info sections