Samples for chart review should optionally include diagnosticreports that have TEXT

[comorbidity]

CORE does not yet support checking if a diagnostic report has text.
@mikix provided this workaround:

select id, presentedForm[1].hash is not NULL as has_text
diagnosticreport

[comorbidity]

Especially important for sites that have BIOSPY as DiagnosticReport -- unknown if this is true today
#38

[mikix]

Note: the library now has aux_has_text fields for DocRef and DxReport core tables.