Initial commit.

Adding all files (including .gitignore). No work has yet been done on the
program interface, whether using command line arguments or an interactive
console interface.

The following needs to be done (ordered by priority) :

* Add the command line interface (using command line arguments to control the
database)
* Import and export of the todolist database (automatic and manual ways to do
it).
* Implement a console interactive interface.
Merge branch 'master' of github.com:dopsi/todo