1222 Add cpp/memilio to doxyfile

Author: kilianvolmer

docs/Doxyfile

@@ -733,7 +733,7 @@ WARN_LOGFILE           =
 # spaces.
 # Note: If this tag is empty the current directory is searched.
 
-INPUT                  = ../cpp/models
+INPUT                  = ../cpp/models ../cpp/memilio
 
 # This tag can be used to specify the character encoding of the source files
 # that doxygen parses. Internally doxygen uses the UTF-8 encoding. Doxygen uses