Stimulus and CoExperimenters are autocompletable and repeatable for multiple items. CoExperimenters have add button.
Merge remote-tracking branch 'origin/balhar' into balhar

Conflicts:
	src/main/java/cz/zcu/kiv/eegdatabase/wui/ui/experiments/AddExperimentScenarioForm.java
	src/main/java/cz/zcu/kiv/eegdatabase/wui/ui/experiments/WizardTabbedPanelPage$TabPanel1.html
	src/main/java/org/apache/wicket/extensions/ajax/markup/html/autocomplete/AddingItemsView.java
Fixed few minor errors caused by last merge.