TRUNK-439: Add Global property for dashboard header concepts and remove obsolete cd4_count concept.
Includes Migration.

By @wginolas and @jthoenes
Remove invisible patientHeaderObsReturnVisit from patientHeader.jsp.

@jthoenes, @wginolas
Merge pull request #1 from jthoenes/TRUNK-439

TRUNK-439: Add Global property for dashboard header concepts and remove ...