remove dangerous mutable deref operator from nodes

transaction: propagate assighment from node ref, add tests

node ref: propagate assighment from node

minor: newline at eof

add AtomicDetachedStorage

minor: copyright in files

transaction: reusable destructor copletion

minor typo

remove SharedState as library type, treat as example

simplify node vector: no longer considering mutable accessors dangerous

more utilities and comments in NodeTransaction

docs: expand fingerprint documentation

use NodeTransaction in shared state, fix abort race

docs: clarify and fix typos in comments

begin example