core: remove edge limitation

[jerome-jutteau]

For multipole brick creation, we have to choose the number of edges on each sides. This have some implications:

• We can have a small performance penalty when there are a lot of non-used edges
• We can't reconfigure the number of edges of a brick, we need to recreate it.

By using a dynamic arrays, we could avoid to choose the number of edge and grow/reduce depending of usage. A candidate would be glib's arrays