add initial_node_age and setter, remove createSortedNodeIndices, add node end pointer to ConstVisibleNodeIterator, add setNodeAge() and isNodeVisible() methods
add initial_node_age and setter, remove createSortedNodeIndices, add node end pointer to ConstVisibleNodeIterator, add setNodeAge() and isNodeVisible() methods

Sometrik/graphlib,Sometrik/graphlib