Bioinfo-doc does not apply indentations in the email notes

[victor5lm]

As per the title, right now the bioinfo-doc module allows for the addition of new lines on the message displayed on the delivery email. However, if there are indentations in this message, these are not shown in the email. For example, given a message that originally looks like this, in which we have a nested list:

Hemos observado lo siguiente:
  - La muestra XXX no ha ensamblado por falta de lecturas
  - Las siguientes muestras presentan contaminaciones:
    - La muestra AAA de AAAAAAAAAAAAA
    - La muestra BB de bbbdbdbdbd

The message looks like this in the email:

Hemos observado lo siguiente:
- La muestra XXX no ha ensamblado por falta de lecturas
- Las siguientes muestras presentan contaminaciones:
- La muestra AAA de AAAAAAAAAAAAA
- La muestra BB de bbbdbdbdbd

All the elements of the list, therefore, are shown at the same level in the email, when it should not be like this.

Related to #289.