multiple documentation tasks are not shown in product gantt()

[danieleTrimarchi]

	documentingSeedMap = DocumentationFeature(
		version=icoStudio230,
		assignee=sara,
		percentageLoad=5,
		timespan=timedelta(days=20)
	) 
	documentingConnectivity = DocumentationFeature(
		version=icoStudio230,
		assignee=hippolyte,
		percentageLoad=5,
		timespan=timedelta(days=15)
	) 
	icoStudio230.addFeat(documentingSeedMap)
	icoStudio230.addFeat(documentingConnectivity)

The tasks exists and the assignee planning is affected.

However, they do not appear in the gantt of a software version (ie: icoStudio 2.3.0) because there is no discrimination on the title; Both tasks are named 'icoStudio 2.3.0 documentation'. As a result, only the first task appear in the version-wise gantt.

The solution is probably to change the label in order to make it unique