API endpoint markallasread: make multi-user aware
reader js: show login/logout/settings upon load
app: add some content to the login/logout/settings views
app css: format all h1 the same way
actually show the new views

API js:use a pool for all AJAX requests so they can be terminated if not needed anymore
make logout work
app: add some explanatory text and headings

add pool level indicator
reader js: stop all ongoing AJAX requests upon logout