Now that handlers are gone, cleaned up table to use arenas exclusively.

Also cleaned up some cruft from table.
diff --git a/benchmarks/compare.py b/benchmarks/compare.py
index 8d62d94..9bdf787 100755
--- a/benchmarks/compare.py
+++ b/benchmarks/compare.py
@@ -58,7 +58,7 @@
 
 
 baseline = "master"
-bench_cpu = False
+bench_cpu = True
 fasttable = False
 
 if len(sys.argv) > 1: