Before 0.4.0 version:
* Finish arrow tools: printing, enhance drawing
* Lot of work on text tool, especially printing and undo/redo
* Implement squiggle bonds, fragments and some reactions related tools
* Enhance Bonobo server
* Some code cleaning
* Rewrite printing code
* Update OpenBabel support
* Update documentation
* Copy, Cut, Paste

Later
* New tools:
	- delocalized bonds,
	- week interactions (e.g. H-bonds),
	- curved arrows,
	- alignement tools for reactions and other groupings,
	- direct export of a molecule to Ghemical,
	- ?
