Make read (`rdrecord`, `rdsamp`) and write (`wrsamp`) functions isomorphic

As noted in #484 , rdsamp and wrsamp are not isomorphic. It is reasonable to expect that what gets read into memory should be sufficient and by default re-create the read file when passing that information to a write function.

We should provide a set of isomorphic read and write functions by doing at least one of these:

1. Making rdsamp and wrsamp isomorphic. Currently they only handle a subset of the parameters in a record object though.
2. Adding a write function which can use all of the information from rdrecord to re-create a read record.

まず、issue #484 の文脈を踏まえて、rdrecord、rdsamp、wrsamp が扱うパラメータとレコード情報を比較します。読み取り API と書き込み API が、入力ファイルを再作成するのに十分なレコード情報を保持できれば完了です。これには、rdsamp と wrsamp を同型にするか、rdrecord の出力用の書き込み関数を追加します。