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/dynamicprofile.h

@@ -48,7 +48,7 @@ public:
     };
 
     DynamicProfileRule();
-    bool matches (const rtengine::ImageMetaData *im) const;
+    bool matches (const rtengine::FramesMetaData *im) const;
     bool operator< (const DynamicProfileRule &other) const;
 
     int serial_number;