LamineCisse/BEP032-examples: channel_type added in channel.tsv (BEP standard) add PowerLineFrequency in ephys-json for ephys_nwb_petersen file add PowerLineFrequency and PowerLineFrequencyUnit in ephys-json for ephys_nix file @ 062c58c4afcfdd09797094f73c209893b7471acd

sprenger 062c58c4af gin commit from nit-ope-de04		3 vuotta sitten
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sub-MS21_ses-PeterMS21180621141817_channels.tsv	42b8f69af8 gin commit from samuel-pc	3 vuotta sitten
sub-MS21_ses-PeterMS21180621141817_contacts.tsv	7341a55b83 gin commit from Saksham	3 vuotta sitten
sub-MS21_ses-PeterMS21180621141817_ephys.json	7341a55b83 gin commit from Saksham	3 vuotta sitten
sub-MS21_ses-PeterMS21180621141817_ephys.nwb	062c58c4af gin commit from nit-ope-de04	3 vuotta sitten
sub-MS21_ses-PeterMS21180621141817_probes.tsv	42b8f69af8 gin commit from samuel-pc	3 vuotta sitten