Aggregation of units now handled by unitUnitEffLevel in inputData instead of 't_aggregate' in mSettings. Allows to choose aggregation threshold by unitAggregate and links it with the efficiency levels (and probably avoids issues since it was previously possible to have different horizons for aggregation and efficiency levels). Addresses issue #22.

Also bug fix to v_onlineMIP to v_onlineLP transfer where v_online was active for both at the t just before the switch.