3080219-pubmed---import: added PMCID (bibcite_pmcid) field; added function to...
3080219-pubmed---import: added PMCID (bibcite_pmcid) field; added function to PubmedEncoder to extract PMCID value from PubMed XML; added update hook to add bibcite_pmcid field to PubMed mapping.
Closes #3080219