Minor modifications after meeting.

The modifications done were:
	- ExperimentListModel has an example of how to avoid reloading the
complete list of conditions when a condition is removed. This example
should be extented to ConditionListModel and SampleListModel.
	- experimentData.zul components were ordered.
	- home.zul and index.zul windows were positioned at the center of the
page using a width of 960px.