reader js: reset appstate on logout
reader js: only react on keypresses in feed view
API endpoint login: use intermediary pseudo exception for login-failures like wrong password etc
api js: fix pool removal code

prior, the removal code would remove the object at a *fixed* location, so after the
first remove the indices would not fit anymore
API endpoint add: give the feed details to the caller
fix display issues with scrollbars
css: proper distances for headings
make login work
fix OPML import display suckiness