Update CMake scripts.

Lowercase the cmake commands.
Add targets for lint, doc and pot (if programs are available).
Add internationalisation support (and change the source layout).
Now support yuicompressor, juicer, uglifyjs, sed and cat as minifiers.
Autogen js dependancies in the minify script.
Fix inkscape install layout.
Merge branch 'dev' of git://github.com/polch/Sozi into polch-dev
Build: moved po files to separate folders
Build: Commenting and small fixes to the CMakeLists
Tools: video export
Tools: cleaner implementation of sozi2pdf
Revert "Player: first attempt to use a custom clip path"

This reverts commit 9d9c7741e991cabddb4db64005e186baffec3f0d.
Revert "Inkscape extension: manage custom clip path"

This reverts commit e0923d59be52002fa957e0b8a66cfec8abad7202.
Revert "Inkscape extension: add a field to set a custom clip path. Better tooltips."

This reverts commit c22eec1f5688d40eb342ad9ed21b3cbac8fa9b9c.
Merge experimantal branch into dev
Merge branch 'dev' of github.com:senshu/Sozi into dev