rrepair, merkle: several fixes in merkle_next_signature_sizes/4 (introduced by e140648fb4)
rrepair, merkle: several fixes in merkle_next_signature_sizes/4 (introduced by e140648fb4)

* EffectiveP1E_L was wrong all the time (copy-paste)
* EffectiveP1E_I was wrong if MyMaxItemsCount or OtherMaxItemsCount was 0
-> phase 1 failure probability was wrong

scalaris-team/scalaris,scalaris-team/scalaris,jvf/scalaris,jvf/scalaris,jvf/scalaris,jvf/scalaris,scalaris-team/scalaris,scalaris-team/scalaris,jvf/scalaris,jvf/scalaris,scalaris-team/scalaris,scalaris-team/scalaris,scalaris-team/scalaris,jvf/scalaris,scalaris-team/scalaris