Metadata header missing #12

Hi @corizzi,

As discussed yesterday, hereby a issue request to add header to the metadata. According to our mail from 14/12/2020 we agreed about the following headers:
[metada-header]
PI = Clém
site_name = Blankaart
SN_Hypstar = 120241
datetime = {datetime}
protocol = {protocol_file_name}
session = premier test en plein air

Could we also add:

Lat=43.69862
Lon=7.30692
Hypernets_tools_version = 000.125478

Thanks!!!
Clémence