Document infrastucture regarding batching and why it is needed

[dzmitry-lahoda]

I cheched default inheritances of AbstractBatcher, chech MiniProfiler.EF6. And do not get what is purpose of Infrastructure namespace? Could you document it and what is difference in output if provide just command replacement, not batch? Could you add Integration test for SQL Server showing batching?

[dzmitry-lahoda]

One I see that SQL Server batcher in NHibernate casts DbCommand to SqlCommand inside.
But how to be sure that profiling implementation is same as default in terms of behaviour?