[Jprojecttimer-developers] Improvement of Gantt Diagram

[Remi P. <pou...@mb...>]

I've committed Task.java and GanttDiagram.java. The improvement of the Gantt
Diagram is not finished yet but you can already find:
- links between tasks to represent predecessor relationship
- null duration tasks represented as losanges
- and some coloring
Any comment or suggestion is welcome.

 Remi