digest: use proper logging, update.php: fix typo

Conflicts:
	update.php
add cache-control: public to the login page so that firefox would bother making a thumbnail

Conflicts:
	include/functions.php
decode html entities in article title on import
don't distort resized images

If images have width/height attributes set and are reduced in size by max-width: auto, they look distorted. height: auto fixes this.
api: add score to getHeadlines/getArticle
ttrssZoom: fix image width
use height : auto in ttrssZoom
use height : auto in cdmContentInner
implement basic feed authentication parameter encryption in the database (FEED_CRYPT_KEY)

Conflicts:
	config.php-dist
	include/sanity_check.php
	include/sanity_config.php
fix handling of blank FEED_CRYPT_KEY
fix double-escaping possible with encrypted passwords
german translation update
subscribe_to_feed: fix typo
quickAddFeed: add placeholder select element to feeds dropdown
use mdash as a separator between title and author
add a %d articles selected element

Conflicts:
	tt-rss.css
Added average color calculation of feeds' favicons for banded display.
fix schema for favicon_avg_color

Conflicts:
	include/functions.php
store favicon color as #rrggbb; process existing favicons
only enable colored favicons in vfeeds; fix RGB triplet packing