Update manual cover and conf.py to 4.4.0

conf.py

@@ -42,9 +42,9 @@ except subprocess.CalledProcessError as exc:
     gitcommithash = release
 
 # The short X.Y version
-version = '4.3'
+version = '4.4'
 # The full version, including alpha/beta/rc tags
-release = '4.3.0'
+release = '4.4.0'
 
 
 # -- General configuration ---------------------------------------------------