chemical_contains(), chemical_equal(), and
chemical_starts_with() to handle http 400 errors and returned information from
those requests. Adjusted the chemical_contains_batch(),
chemical_equals_batch(), and chemical_starts_with_batch() to return named
lists of valid and invalid search results, with invalid results containing
information from 400 errors (@kisaacs1, #11).Added check_existence_by_dtxsid(), check_existence_by_dtxsid_batch()
functions. Updated the Chemical.Rmd vignette to include examples of how to use
these functions (#27).
Added get_httk_data(), get_httk_data_batch(),
get_general_exposure_prediction(), get_general_exposure_prediction_batch(),
get_demographic_exposure_prediction(),
get_demographic_exposure_prediction_batch() functions. Updated the
Exposure.Rmd vignette to include examples of how to use these functions (#6).
ccdR package for better alignment
with US EPA CTX APIs.