Export surface receiver results separately for each surface receiver

[Picaut]

Currently, the results for all surface receivers are exported in the same result folder. It could be useful that the results are exported in a separate folder for each surface receiver.

[Picaut]

The name of the element/folder should be coherent with the name of the corresponding "Surface receivers". In the example below, two surfaces receivers were created 'toto' and 'tata", but the name of the elements in the results folder is not coherent:

Prefer: toto/ toto/Sound level toto/EDT tata/ tata/Sound level tata/EDT