various bits of work (see details)
@ changed client resend delay from one second back to five seconds
+ add IsFormatted to ChunkPushPullSystem
+ ChunkPushPullSystem now writes signature
@ changed ChunkPushPullSystem signature
+ added RWPastMetaDataException for SimpleFS
+ added IsFormatted to SimpleFS
+ added signature write and check to SimpleFS
@ (Set/Get)NameLength now known as (Set/Get)MetaLength