Minor whitespace fixes.
Remove unasked for 'medium' header bottom border.

Without a bottom border specified, using border-image causes an
inherited 'medium' (c. 3px) border to appear. Also repeat header
border image, rather than default stretch.
Make map page sidebar flush with edges of window.
Remove reporting sidebar from .com cobrand.
On map page, indent logo and expand navigation to width.
Fix display of user menu on map page.
Avoid gap below header on medium width screens
Don't output footer navigation on map page.

It's invisible anyway and pushes content bottom up a bit.
Various fixes to cobrands post zero content margin