This function goes through metadata columns, dataquieR supports
and verifies for these, that they follow its metadata conventions.
util_validate_known_meta(meta_data)invisible(NULL)
data.frame the data frame that contains metadata attributes of study data
Other metadata_management:
CAN_THIS_BE_REMOVED_util_combine_missing_lists(),
util_dist_selection(),
util_find_free_missing_code(),
util_find_var_by_meta(),
util_get_var_att_names_of_level(),
util_get_vars_in_segment(),
util_looks_like_missing(),
util_no_value_labels(),
util_validate_missing_lists()