[POS-14] Define better skeleton of block processing in Storage.Block
[POS-14] Define better skeleton of block processing in Storage.Block

Add better comments, fix some bugs.
Only tryContinueAltChain is left to be implemented.

input-output-hk/cardano-sl,input-output-hk/cardano-sl,input-output-hk/pos-haskell-prototype,input-output-hk/pos-haskell-prototype,input-output-hk/cardano-sl,input-output-hk/cardano-sl,input-output-hk/pos-haskell-prototype