todo list

- Are the methods isExifTagSet() and isIptcTagSet() really useful ? They can be "emulated" by trying to read a tag's value and silently catching the exception if it is not set...
- Rewrite the exiv2 command-line tool and the test binaries in Python and (Python) scripts to run the same tests that are run to test exiv2
- Rewrite the docstring documentation of the module using epydoc's syntax (http://epydoc.sourceforge.net/manual-fields.html)
- Write a complete documentation for the binding and it uses
- Write unit tests (http://docs.python.org/lib/module-unittest.html)
- Use pkgconfig with scons in order to check the dependencies before compiling (http://www.scons.org/wiki/UsingPkgConfig)