BS-2419
Reset datatype on data when copying a data from a diagram to another.

Conflicts:
	bundles/plugins/org.bonitasoft.studio.common/src/org/bonitasoft/studio/common/emf/tools/ModelHelper.java
	bundles/plugins/org.bonitasoft.studio.properties/src/org/bonitasoft/studio/properties/sections/forms/commands/DuplicateFormCommand.java