example config: improve readability, make paths sed'able

doc/example.cfg

@@ -1,15 +1,13 @@
 [general]
 max-load		6
 load-interval		30
-temporary-directory	$HOME/.atom/tmp
-database		$HOME/.atom/atom.db
+temporary-directory	%HOME%/.atom/tmp
+database		%HOME%/.atom/atom.db
 debug			0
 
 [source]
 path		/var/lib/mpd/music
 id3charset	iso-8859-15
-# you should not skip application/octet-stream, they could be somthing similar
-# to "Audio file with ID3 version 2.4.0, unsynchronized frames"
 
 [Ogg]
 path		/mnt/Musique-OggQ2
@@ -17,6 +15,9 @@ format		vorbis
 quality		1
 channels	2
 frequency	44100
+
+# you should not skip or copy application/octet-stream, they could be something
+# similar to "Audio file with ID3 version 2.4.0, unsynchronized frames"
 copy_mime-type	image/*
 copy_mime-type	text/*
 
@@ -24,6 +25,7 @@ copy_mime-type	text/*
 path	/mnt/Musique-mp3.test
 format	mp3
 bitrate	96
+
 # rename file, path unchanged
 rename	%{track}--%{artist}-%{title}
 # change the whole filepath