* poppler/FontInfo.h: Add getFile() function that returns
the path of the font that is beign used in the system to
represent that font
* qt4/src/poppler-document.cc:
* qt4/src/poppler-fontinfo.cc:
* qt4/src/poppler-private.h:
* qt4/src/poppler-qt4.h: Add the file() function
* qt4/tests/poppler-fonts.cpp: Show the path of the font
used to represent each font

May be interesting to have in the other frontends