add experimental cooldown after headlines buffer had been manipulated before auto catchup is enabled
only unmark articles which had been processed when automarking

fix default sorting not taking score into account, remove unused SORT_HEADLINES_BY_FEED_DATE remnant

updater: add /bin and /usr/bin to path before looking for binaries in case of php-fpm empty environment or whatever

Fix typos in czech trans and add few directly visible strings

French translation update

Some more german translations

reduce potential freak agitation

Allow tuning fetch timeouts from config.php