org: simplify babel blocks using #+PROPERTY: header-args

This feature is in Org 9, which is already required.

* doc/org/autcross.org, doc/org/autfilt.org, doc/org/compile.org,
doc/org/concepts.org, doc/org/csv.org, doc/org/dstar2tgba.org,
doc/org/genaut.org, doc/org/genltl.org, doc/org/hierarchy.org,
doc/org/hoa.org, doc/org/ioltl.org, doc/org/ltl2tgba.org,
doc/org/ltl2tgta.org, doc/org/ltlcross.org, doc/org/ltldo.org,
doc/org/ltlfilt.org, doc/org/ltlgrind.org, doc/org/ltlsynt.org,
doc/org/oaut.org, doc/org/randaut.org, doc/org/randltl.org,
doc/org/satmin.org, doc/org/setup.org, doc/org/tools.org,
doc/org/tut01.org, doc/org/tut02.org, doc/org/tut03.org,
doc/org/tut04.org, doc/org/tut10.org, doc/org/tut11.org,
doc/org/tut12.org, doc/org/tut20.org, doc/org/tut21.org,
doc/org/tut22.org, doc/org/tut23.org, doc/org/tut24.org,
doc/org/tut30.org, doc/org/tut31.org, doc/org/tut50.org,
doc/org/upgrade2.org: Simplify SRC block setups for sh, python and
C++.  Also fix a few typos and examples along the way.

doc/org/compile.org

@@ -3,6 +3,7 @@
 #+DESCRIPTION: How to compile C++14 programs using Spot
 #+INCLUDE: setup.org
 #+HTML_LINK_UP: tut.html
+#+PROPERTY: header-args:C+++ :results verbatim :exports both
 
 This page is not about compiling Spot itself (for this, please refer
 to the [[file:install.org][installation instructions]]), but about how to compile and
@@ -14,7 +15,7 @@ As an example we will take the following simple program, stored in a
 file called =hello.cc=:
 
 #+NAME: hello-word
-#+BEGIN_SRC C++ :results verbatim :exports both
+#+BEGIN_SRC C++
   #include <iostream>
   #include <spot/misc/version.hh>
 
@@ -30,7 +31,7 @@ greetings and the Spot version:
 
 #+RESULTS: hello-word
 : Hello world!
-: This is Spot 1.99.6a.
+: This is Spot 2.7.2.dev.
 
 
 To successfully compile this example program, we need a C++ compiler,