[Trennmuster] pattern and character analysis

[Werner LEMBERG]

> Werner has already reviewed my contribition and send me corrections
> which I have fixed.  Could one of you review the attached file as
> well and when all is OK add it to the GIT repo in
> wortliste/skripte/python/ please?

OK.  However, some comments:

. I've misunderstood what `pattern_spacers' means.  A better
  translation is probably »Platzhalter«.

. Im »Zeichen-Histogramm« I think it's better to unify uppercase and
  lowercase.  It makes the histogramm more readable.

. In »histogram-wortzeichen«, the caption of the image contains an
  incorrectly displayed UTF-8 character.


    Werner