This is required for the standard epi model output, which has units of
ha_infected per ha_cell, because the model risk thresholds are fitted
for units of ha_infected per ha_wheat.

chore: Tidy imports

changing the scp logic and the ssh file checking logic to use a different command if no server name is set

restoring the original sys.exit to ProcessorUtils, dealing with exit commands in the unit tests by catching them