fda_drugs() now directly use a fixed url to download the data
faers_meta(internal = TRUE) will always use the cache data in the package.
Rename "gndr_cod" into "gender" for periods before 2014q2, and rename "sex" into "gender" for periods after or equal to 2014q2.
"sex" was added, which recoded any values other than "F" or "M" as NA.
fix error when download failed
meddra augment additional argument primary_soc to help save the full meddra data