LPS-39991 Remove unnecesary and wrong xml element attribute
LPS-39991 Apply remove
LPS-39991 Convert JCPDH to handle its data throught its preferences with implementing the doProcessExport/ImportPortletPreferences instead of the doExport/importData methods
LPS-39991 Apply the same pattern to the other display portlets
LPS-39991 Add new method to differentiate the display portlets
LPS-39991 Update all portlet preferences for display portlets because their data is always imported if present
LPS-39991 Remove old unnecessary data handler booleans from display portlets
LPS-39991 Do not display content section for display portlets on the portlet export-import-publish UI's