In island.py

[abhiroyg]

1. We should stop connecting nodes to islands, if the resultant load/produce is less than or equal to zero on all islands.
2. We should connect to/check for nodes from not only the generator of the island but also other nodes of the island.
3. Don't iterate over the remaining nodes but on the islands, after getting the first set of islands.

[vamshiballikonda]

1. Stop connecting nodes to the island when the resultant sum is non positive. And if all the islands resultant goes to non positive, the code should break and display the un connected nodes also.
2. While connecting the islands, all possible nodes should be connected in the island. If any element is added to the island, the adjacent nodes also is to be considered for adding until the resultant is non positive.

[abhiroyg]

Combine nearby islands with opposite signs.