EFA#70 Multisession support

[cubitusgh2]

When several persons go on a trip together - each one in his/her own boat - then every single trip needs to be entered.

It would be better if you could enter a single trip and add several person/boat entries, and that there are multiple single sessions created by saving the trip.

This should also work for late entry.

[cubitusgh2]

Solution see https://github.com/cubitusgh2/efa_ksc_replay/tree/MN_EFA_070_MultiSessions_Replay