Switch to side-by-side view

--- a/src/INSTALL
+++ b/src/INSTALL
@@ -94,6 +94,9 @@
      * MP3: Recoll will use the id3info command from the id3lib package to
        extract tag information. Without it, only the file names will be
        indexed.
+
+     * Pictures: Recoll uses the Exiftool Perl package to extract tag
+       information. Most image file formats are supported.
 
    Text, HTML, mail folders Openoffice and Scribus files are processed
    internally. Lyx is used to index Lyx files. Many filters need sed and awk.