Add multi-frame handling.

- Exif of all frames are displayed in the Editor's Exif tab (without
separator)
- isHDR and isPixelShift is added to the data files stored in cache
- In the Editor panel, the QuickInfo frame display the HDR and
PixelShift information, as well as the number of frame and bit-depth for
HDR image
- the number of frame is provided by dcraw. If not set, it is provided
by the Exif's main IFD count
- the PixelShift information (for Pentax as of now) is provided by
looking at the Exif informations
- the HDR information is provided by the Exif information of the first
frame for Pentax raw files, or by the bitspersample, sampleformat and
compression tags for other files

TODO: add icons to the thumbnails to tag HDR and PixelShift files.

rtengine/ffmanager.cc

@@ -338,11 +338,8 @@ ffInfo* FFManager::addFileInfo (const Glib::ustring& filename, bool pool)
             return &(iter->second);
         }
 
-        RawMetaDataLocation rml;
-        rml.exifBase = ri.get_exifBase();
-        rml.ciffBase = ri.get_ciffBase();
-        rml.ciffLength = ri.get_ciffLen();
-        ImageData idata(filename, &rml);
+        RawMetaDataLocation rml(ri.get_exifBase(), ri.get_ciffBase(), ri.get_ciffLen());
+        FramesData idata(filename, &rml, true);
         /* Files are added in the map, divided by same maker/model,lens and aperture*/
         std::string key( ffInfo::key(idata.getMake(), idata.getModel(), idata.getLens(), idata.getFocalLen(), idata.getFNumber()) );
         iter = ffList.find( key );