Assorted misc cleanup.

Mostly emoving un-needed freind declarations.
iClarify types sizes in benchmark
Fix broken random number gen in the benchmark!
Add a no-op to the benchmark, for baselining
Use case statement for the tests
Start adding scheme tests
Add a testIncomingSet benchmark
Increase the default size of the atomspace

... to a slightly more realistic default value
ifix benchmark timing bug
corrections to how scheme is benchmarked
Provide some benchmark results.
more scheme benchmarking results.