#1 Display past, future and vacation

[Guilhem BONNEFILLE]

In order to know what is scheduled, what is done and
what MUST be done, it will be interresting to be able
to see (differently) :
- past days (past command),
- future days (future command),
- vacation days (vacation command),
- planned days (days computed by opensched).

This could be interesting both in gant and util diagram.

[Guilhem BONNEFILLE]

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user_id=50353

Past and vacation in gantt will be included in V0.4.2. Check
CVS to improve from now.