New features for gqview

Hi,

During Novell Hack Week we started to enhance gqview with these features:

- Sort images according to various aspects, including technical quality. It 
involves selecting images in several passes, side to side and fullscreen 
image evaluation, with ability to iteratively fine-tune the selection.

- Interoperability: all operations that modify images (delete, move, ...)
can be replaced with external commands or scripts. This allows integration
of gqview into various image processing workflows.

- Improve keywords and tags management

- Standard metadata formats - fully support Exif, IPTC and XMP metadata, store
keywords in these formats. XMP metadata can be stored in additional "sidecar" 
files.

- RAW + Jpeg handling - RAW previews are interesting only so far as there is 
no corresponding Jpeg image (directly from camera or created by RAW 
processing) -> handle RAW + Jpeg together.


What is already implemented:
- side-to-side image comparison, with connected scrolling and zoom
- basic support for external operations (copy, move, delete)
- replacing "gchar *path" with a reference to FileData structure across the 
code, to allow handling of grouped files (xmp sidecars, RAW + Jpeg).

The project svn repository is here
http://svn.opensuse.org/viewcvs/GQViewE/

The code serves us as a playground for testing the ideas and it does not yet 
have production quality. However in the long term, we would like to merge it 
back to gqview.

The (quite outdated) project page is here:
http://idea.opensuse.org/content/ideas/enhanced-image-viewer-for-efficient-photo-management


Vladimir Nadvornik
Petr Ostadal
Zuzana Petrova

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