Search Parameter SearchType/DataType checking

[brianpos]

While validating a search parameter fhirpath expression ensire that the datatype returned by the fhirpath expression is compatible with the search type.

Reference table found in the core spec here:
http://hl7.org/fhir/search.html#table

And the code that I used in my checker is here
https://github.com/brianpos/Hl7.Fhir.FhirPath.Validator/blob/master/src/Hl7.Fhir.Base.FhirPath.Validator/SearchExpressionValidator.cs#L245

[lmckenzi]

Moved to HAPI here: hapifhir/org.hl7.fhir.core#1458