Replace autotools with CMake at the toplevel, backend now compiles with newer GCC

README

@@ -9,18 +9,14 @@ For convenience, here's a short glance at the
 build process (while the manual isn't finished):
 in the source package root directory, type:
 
-	mkdir =build && cd =build
-	../configure --prefix=/path/to/installation/dir
-	make
-	su -c "make install"
+	mkdir build && cd build
+	cmake .. -DCMAKE_INSTALL_PREFIX=/path/to/installation/dir
+	cmake --build .
+	sudo cmake --build . --target install
 
-if you want to generate API documentation via Doxygen:
+if you want to generate API documentation via Doxygen and makeinfo: 
 	
-	make apidox
-
-if you want PDFs of the user and developer manuals,
-
-	make pdf
+	make doc
 
 As simple as that.