.gitignore now includes .cabal-sandbox and dist/ directories for the submodles.
A new 'Benchmark.Utils' module collects utilities functions used across all benchmarks.

At the moment, it contains a procedure 'doSomething' that prints a 'String' to 'stderr'.
Library version reactive-banana == 0.8.0.0 is now used for benchmarking. Include reactive-banana in some of the benchmarks again.