Re-Join Net Segments

[jlopezbi]

now that net segmentation is done, need to be able to rejoin segment. hey maybe store the original transform neh? well that only workes if going back to original spot, which is unlikely if user is smart. Otherwise the more general case is rejoining the segment in another spot, which means translating and rotating to that area.

For areas where the user wants to ensure a connection, this means figuring out another cut so that the connection is possible.

[jlopezbi]

1) is cut edge? 2) find sibling cut edge 3) is sibling part of same island? if yes: segment island and then re-join if no: re-join sibling's island to selected cut-edge