Trackers:
3848: renaming the Availability resource to schedule
3847: removing isModifier from RelatedPerson fields that don't need it
3076: More guidance on Encounter vs Appointment (on both resources)
3581: More guidance on using RelatedPerson vs Patient Link vs Person

git-svn-id: http://gforge.hl7.org/svn/fhir/trunk/build@3834 2f0db536-2c49-4257-a3fa-e771ed206c19