[base template header] changeset 6669:e4532c6acf34 introduce a visual regression on standard site, fix it by merging header-left/header-center context, it simplify things and have proper display. Cubes using 'firstcolumn' css class will have to be upgraded

include *.py
include */*.py
recursive-include data *.gif *.png *.ico *.css *.js
recursive-include i18n *.po
recursive-include wdoc *