Problem with a font

[Walter Garcia-Fontes]

I have a problem using this font:

http://puna.upf.edu/Escolar_N.ttf

For instance:

\version "2.18.2"

\paper {
   #(define fonts
      (make-pango-font-tree
       "Escolar2"
       "Escolar2"
       "Escolar2"
       (/ staff-height pt 20)))
}

\markup{This is showing the problem '}

The apostrophe is printed too low. This is what
I get:

http://puna.upf.edu/letras.pdf

If I use this same font in, say, LibreOffice Writer, I
get the apostrophe as it should be. Here is a
screenshot:

http://puna.upf.edu/writer.png

I'd like to understand why LilyPond is not able
to render this font as Writer, and if there is anything
I can do to solve it. In Writer, there is
also the possibility of having Bold, Italic and
Italic-Bold with this single font file, but in Lilypond
this is not possible.

Walter

--
Walter Garcia-Fontes
L'Hospitalet de Llobregat