use separate sort and sort order buttons for album and artist views and connect signals for these buttons to sort independently
give new artist icons its own config called sort_artist
work in progress - connect artist sort buttons and sort viewable albums
Merge branch 'master' into sort

Conflicts:
	po/fr_CA.po
tidied up sort actions
add new sprites, fix sorting of artists column so that we cannot become unsorted and finally, fix a bug on startup showing sort key error
Merge branch 'sort'

Conflicts:
	po/fr_CA.po