Improve the parser of the BSF file format to support the version number 105

[Alzathar]

From Marcos Duarte on the mailing-list:

Now, the AMTI .bsf file has a new version number, 105. The difference in relation to version 100 (the version BTK can read) is that data is saved as 8-byte doubles and not anymore as 2-byte integers. And the data is already in engineering units, at least when a new AMTI amplifier is used and the full conditioned mode is selected in the AMTI configuration software.

For whom is interested, the following page describes a Python code to open the .bsf file at the new version 105: https://github.com/demotu/BMC/blob/master/notebooks/AMTIbsfFile.ipynb.