org.hl7.fhir.core/RELEASE_NOTES.md

Validator:

• Add support for $index on aggregators in FHIRPath
• don't fail with an exception if an unknown resource type appears in contained resource
• improved validation for some value sets that are based on unknown code systems
• add the -verbose parameter, and add additional verbose messages

Conversion code:

• Ignoring abatementBoolean when converting from dstu2 to r4

Other code changes:

• Fix rendering of slices so type on slicer is not hidden
• Fix rendering for most resources - remove empty tables (e.g. text element, that shouldn't render)
• Fix NPE rendering code systems with some kinds of properties
• Improve rendering of questionnaires (icons, option sets)