Fixed delayed download progress display in Web PVR Manager

STDERR needs to be unbuffered so that the download progress display
isn't delayed for HLS streams.

Closes #270

get_iplayer

@@ -76,7 +76,8 @@ use constant FB_EMPTY => sub { '' };
 my %SIGORIG;
 # Save default SIG actions
 $SIGORIG{$_} = $SIG{$_} for keys %SIG;
-$|=1;
+STDOUT->autoflush(1);
+STDERR->autoflush(1);
 # Save proxy env var
 my $ENV_HTTP_PROXY = $ENV{HTTP_PROXY} || $ENV{http_proxy};