Added the indications and processes when a noded goes offline:
The previous nodes that the dead was serving ll connect to a next available node
The immediate prev node informs the immediate next node to start serving the dead
Added following features:
inidicate the next node when a sn is down
inidicate the next node when a sn is up
request backuped data when a sn comes back online
IDB search data will only search in a lowerBound keyRange (thus reduces searching)
new IDB search option : can send only the last data matching the pattern
added type to be searched in request (optional)
made receiverID as optional in request data filtering
SuperNode-Client will automatically try to reconnect to SuperNodeWSS when disconnected
Blockchain data will be automatically refreshed at interval (set time = 1hr)