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1. It means that your infeed is connected between one of the line conductors (brown, black, grey) and the neutral conductor (blue).

2. CT4 also has a different burden resistor in the emonTx, that is the reason for the different Ical. That assumes that the CT is the same. If you use a different CT, or you change the burden resistor, you will need a different Ical.

3. It is difficult to check the phase sequence - an old electricians joke is if the (3-phase) motor turns in the right direction first time, go and buy a lottery ticket because today is your lucky day! The best you can do is assume that the circuit breaker is correct, it probably will be, and when you get it working, check that the results are what you expect. It should be easy to exchange L2 & L3 if not.
It is possible to use an R-C network to derive a phase-shifted voltage between two phases, and measure the voltage between that and the third phase, but I do not recommend you attempt that as it could well be dangerous unless you know exactly what you are doing.

Thanks for the reply. 

1. I do not quite get it yet. What is an infeed line. Is that if I have power production (solar, heatpump etc)?

3. I figured it out when I calibrated the the phaseshift and they where in order L1, L3, L2 (black, black, brown). 

An "infeed" is the accepted term (in electrical power engineering in the UK) for the source of power that feeds in to a distribution board or switchboard.

Here is a way of determining the phase rotation. This is a Spice simulation. V1, V2 & V3 represent 3 ac-ac adapters connected in star.