changes on Backup, Client, SimpleFS, misc, and Server
+ Backup: added FileInfo class
+ Backup: implementing ValidRaise (establishes lock and maintains link)
+ Client: added Exchange8 (got lost many commits ago)
@ Client: renamed and reworked Lock and Unlock to BlockLock and BlockUnlock
+ SimpleFS: implementing locking methods
@ misc: did some changing of packet codes
+ misc: now has urem to free IDs on link drop
@ Server: changed/implemented new locking system based on links