Fixed data block size bug for the client

PS. Observing an extra weird null response intermittently, which is currently being handled by a hack

Added some HPDOS architecture diagram

# Conflicts:
#	code/hpdos_client/app.config
#	code/hpdos_client/app/src/main/java/HpdosClient/ClientRunner.java

Added better metrics to client.
Client now configurable through config file

Needs more testing

Preliminary tests down on key create and read