* Don't consider a file binary if the first five lines contain a character
above chr(127) or below ' ' (32) but just check whether the first five
contain a character below ' ', this should fix files being marked as binary
due to them containing multibyte characters such as three characters in my
name.
*
http://mail.wikimedia.org/pipermail/wikitech-l/2005-December/033184.html