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.

Comienza comparando los parámetros y la información de los registros que manejan rdrecord, rdsamp y wrsamp, teniendo en cuenta el contexto de issue #484. Se considera terminado cuando las APIs de lectura y escritura conservan suficiente información de los registros para recrear el archivo de entrada, ya sea haciendo que rdsamp y wrsamp sean isomorfos o añadiendo una función de escritura para la salida de rdrecord.