A rebalancing of level 0 wiped out the Connectors between Levels 0 and 1 as well as the "self connector" of Level 0 to itself. This PR rebuilds them so that they are present just as they are in all other cases when a PatchHierarchy is created and/or regridded by GriddingAlgorithm. For #256
A rebalancing of level 0 wiped out the Connectors between Levels 0 and 1 as well as the "self connector" of Level 0 to itself. This PR rebuilds them so that they are present just as they are in all other cases when a PatchHierarchy is created and/or regridded by GriddingAlgorithm. For #256