Timelines not bound to calendar dates

[GoogleCodeExporter]

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Often projects don't have a precise start date, so it would be good to
compile the project with reference to a 0-day and see the amount of day
form day 0 instead of dates.

When the starting date is set it should be possible to define it and have
the grpah change accordingly.

As an alternative there should be a "Move all" option to shift ALL tasks of
a certain amount of days in the future or in the past.

Original issue reported on code.google.com by [email protected] on 19 Feb 2010 at 5:36