Add incorrect inittialization to reliable_state for window size and seq/acknos, work on recvpkt
Encountering error dereferencing pointer to incomplete type for r->c->conn_bufspace in rel_recvpkt
Add lastPacketTouched to reliable_state, change rel_create to initialize correctly, change rel_rcvpkt to send ACKs correctly and output data to rel_output, comment rel_output to indicate where data lives
Bug fixes to cksum calculation for rel_rcvpkt