Generalise footer-marketing template.

Move UK specific text to fixmystreet.com template.
Don't height fix any full width page.
Move footer styling to shared stylesheet.

This look works well on the default styling also.
Move some data: URIs to FixMyStreet style.

Easier if the default shared styles stick with the sprite for
everything, then you can just change that sprite rather than having to
override CSS as well.
Only show text on /reports if appropriate.

Only show "select..." if more than one body, and only mention greyed out
lines if there are any. Fixes #869.