inject headlines-spacer even if cdm auto catchup is disabled
js: add collapsed and expanded hooks
remove cdmUnexpandArticle
fetch: better checking for 1970- date
subtoolbar: add last updated when hovering over originating site link
Merge branch 'master' of github.com:gothfox/Tiny-Tiny-RSS
fix warning when creating feed last updated timestamp
base if-modified-since on last received article, not feed update timestamp