No text extraction for powerpoint slides when 'squishable' is not set.

Created by: Anonymous

Original issue 319 created by aurelien.tomass... on 2013-03-22T10:53:16.000Z:

1.Create a new pptx file
2.use the openXmlFilter to display all the text units

With okapi-lib 0.19, the text units displayed are only those contained into the MasterSlide, not the usable slides.

When investigating, I saw that slides doc typed "slide+xml" are read as Document_Part, and not subdocument. In the source net/sf/okapi/filters/openxml/OpenXMLFilter.java , I think line 649, documents "notesSlide+xml" and "slideMaster+xml" are translated but not "slide+xml".