anchor.diff:    | ctrlc ctrld    | add a deadline to a TODO element                 |
     | ctrlc ctrls    | append a datetime                                |
    
  -** SPC commands
  +== SPC commands
      spc mee    - export in different kind of files
   
  -** Todo & cie
  -*** TODO todo example 
  +== Todo & cie
  +*** TODO todo example
       DEADLINE: <2018-04-20 Fri>
       at the end of the title line (after example here) hit shift alt enter
       to go to the next line with another todo
  
positive.code: 
  #+OPTIONS: toc:nil
  
  * Org 
  ** categories
  
     #+BEGIN_SRC c++
     void process_stuff(my_super_class* ptr);
     
     int a = 2;
     #+END_SRC
  
  
negative.code:         """
          print ("will process {} + {}".format(a, b))
          return (a,b)
       example(2, 18)
     #+END_SRC
  
  == Commands
    | command        | action                                           |
    |----------------+--------------------------------------------------|
    | shift tab      | changes  fold                                    |
  