Implement Random First Piece and Rarest First piece selection
Change comment symbol from semicolon to sharp
Fix Debug info of random seeds
Change bandwidth info to transmission time info
Add hash table for mapping neighbor_pid to its propagation delay between peer(neighbors holder)
Implment Cluster-Based Peer Selection
Remove initialization of first enum element
Remove PEERLEAVE from enum RSC and update new comment
Update important comment of NUM_PEER
Fix debug info
Comment out arrival rate
Change while-condition of event loop
Add if condition for checking the neighbor is exist or not
Comment out the reading of ARRIVAL_RATE argument
Fix typo