val importInDatable :
  log_error:ImportErrors.t ->
  conf:ImportConf.Syntax.t ->
  dirname:string ->
  ImportAnalyser.Dependency.t ->
  _ ImportSQL.Db.t ->
  ImportCSV.DataType.t array option Lwt.t
(** Load an excel spreadsheet in an SQLite database. 

Return the header if at least one row where present *)