rename favicon.png to logo_16x16.png

This was never used as a favicon, it's just a png version of the
favicon.ico. It's actually used for the freedesktop menu file.

Assistant/Install/Menu.hs

@@ -21,7 +21,7 @@ installMenu command menufile iconsrcdir icondir = do
 	writeDesktopMenuFile (fdoDesktopMenu command) menufile
 	installIcon (iconsrcdir </> "logo.svg") $
 		iconFilePath (iconBaseName ++ ".svg") "scalable" icondir
-	installIcon (iconsrcdir </> "favicon.png") $
+	installIcon (iconsrcdir </> "logo_16x16.png") $
 		iconFilePath (iconBaseName ++ ".png") "16x16" icondir
 #endif
 

Makefile

@@ -119,7 +119,7 @@ linuxstandalone-nobuild: Build/Standalone Build/LinuxMkLibs
 	strip "$(LINUXSTANDALONE_DEST)/bin/git-annex"
 	ln -sf git-annex "$(LINUXSTANDALONE_DEST)/bin/git-annex-shell"
 	zcat standalone/licences.gz > $(LINUXSTANDALONE_DEST)/LICENSE
-	cp doc/favicon.png doc/logo.svg $(LINUXSTANDALONE_DEST)
+	cp doc/logo_16x16.png doc/logo.svg $(LINUXSTANDALONE_DEST)
 
 	./Build/Standalone "$(LINUXSTANDALONE_DEST)"