Restructure README

README

-Compile:
+feh - Imlib2 based image viewer
+
+ * <https://derf.homelinux.org/p/feh/>
+ * <http://linuxbrit.co.uk/feh/>
+
+
+Dependencies:
+
+ * giblib
+ * Imlib2
+ * libpng
+ * libX11
+
+
+Recommended:
+
+ * jpegtran  (supplied by the jpeg library, for lossless image rotation)
+ * wget      (for http/ftp support)
+
+
+Installation:
 
 $ make
 $ sudo make install
@@ -11,22 +31,23 @@ variables instead of editing it. E.g.:
 CFLAGS='-g -Os' make
 export DESTDIR=/tmp/feh PREFIX=/usr; make && make install
 
-If you want to run a few non-interactive tests, use "make test". This will
-require a standard perl distribution (especially the "prove" script) and the
-Test::Command module. If mdocml is installed, it will be used to check the
-manual syntax, otherwise that test will be skipped.
 
-What is feh?
+Testing (non-X):
 
-https://derf.homelinux.org/p/feh/
-http://linuxbrit.co.uk/feh/
+$ make test
 
-Dependencies:
- * giblib
- * Imlib2
- * libpng
- * libX11
+Requires perl >= 5.10 with Test::Command. The tests are non-interactive and
+work without X, so they can safely be run even on a headless buildserver.
 
-Recommends:
- * jpegtran  (supplied by the jpeg library, for lossless image rotation)
- * wget      (for http/ftp support)
+
+Testing (X):
+
+Requires
+ * perl >= 5.10
+ * X11::GUITest
+ * Xnest
+
+$ make test-interactive
+
+Be aware that this is quite experimental, so far the X-tests have only been
+run on one machine. So they may or may not work for you.