Potential mistake in Blocking2D structure when a new block is created

[claireroche]

In the Blocking2D.cpp of folder ig/src ,

1. When we want to create a block using newBlock function, I think there is a mistake while updating the connectivities.

I think lines 95-96:
Node n3 = get<Node>(AN3); n1.add(b);

should be replace by
Node n3 = get<Node>(AN3); n3.add(b);

2. I think there is a second mistake, at l. 898:
   for(int j = 0; j<getNbDiscretizationI(); j++){

the limit should be on getNbDiscretizationJ()

[create-issue-branch]

Branch issue-340-Potential_mistake_in_Blocking2D_structure_when_a_new_block_is_created created!