Function sonnerie::formatted::add_from_stream_with_fmt

pub fn add_from_stream_with_fmt<R: BufRead>(
    tx: &mut CreateTx, 
    db: &DatabaseReader, 
    input: &mut R, 
    timestamp_format: Option<&str>, 
    nocheck: bool
) -> Result<(), WriteFailure>

Reads from text, each record reports its own format.

Like add_from_stream except the format string comes after the timestamp