Python 3.5 is now needed

* NEWS, README, HACKING, doc/org/install.org, m4/pypath.m4: Adjust.

HACKING

@@ -42,7 +42,7 @@ since the generated files they produce are distributed.)
   A complete LaTeX distribution, including latexmk and extra fonts
     like dsfont.sty.
   ImageMagick
-  Python >= 3.3, IPython >= 2.3
+  Python >= 3.5, IPython >= 2.3
   Jupyter >= 4, with nbconvert
   GraphViz
   Java >= 1.7 (needed to run PlantUML while generating the doc)

NEWS

@@ -1,6 +1,6 @@
 New in spot 2.10.0.dev  (not released yet)
 
-  Nothing yet.
+  - Python 3.5 is now required.
 
 New in spot 2.10  (2021-11-13)
 

README

@@ -76,7 +76,7 @@ Requirements
 Spot requires a C++17-compliant compiler.  G++ 7.x or later, as well
 as Clang++ 5.0 or later should work.
 
-Spot expects a complete installation of Python (version 3.3 or later).
+Spot expects a complete installation of Python (version 3.5 or later).
 Especially, Python's headers files should be installed.  If you don't
 have Python installed, and do NOT want to install it, you should run
 configure with the --disable-python option (see below).

doc/org/install.org

@@ -22,7 +22,7 @@ successful development build]].
 Spot requires a C++17-compliant compiler.  =g++= 7.0 or later, as well
 as =clang++= 5.0 or later should work.
 
-Spot expects a complete installation of Python (version 3.3 or later).
+Spot expects a complete installation of Python (version 3.5 or later).
 Especially, Python's headers files should be installed (the package to
 install has a name like =python-dev= or =libpython3-dev= in most
 distributions).  If you don't have Python installed, and do NOT want

m4/pypath.m4

@@ -1,5 +1,5 @@
 AC_DEFUN([adl_CHECK_PYTHON],
- [AM_PATH_PYTHON([3.3])
+ [AM_PATH_PYTHON([3.5])
   case $PYTHON in
     [[\\/$]]* | ?:[[\\/]]* );;
     *) AC_MSG_ERROR([The PYTHON variable must be set to an absolute filename.]);;