Clojurians Log v2

@whilo PRs are ready for carmine and clutch. What should I tackle next?

I have been thinking about adding another byte to describe the serializer configuration, which is orthogonal to the storage layout. That would allow to swap serializers for stores at some point. In particular we have code to introduce LZ4 compression for the binaries.

@alekcz360 This is really cool, I will take a look at them soon.