Valid/invalid messages and message wrapping
failures and refactoring
Failure handling v-0.1 (slow)
failure handling modified and debugged with dining philosophers test
copy and join with interrupts attemp 1 - not working
failure handling working for copy and join push
minor fixes
bug fixes
cleaning up
refactoring, optimistic retry made optional
further refactoring (maybe final)
comments added to core classes
failure handling (fh1) merged into master