"This series deals with copies and moves of mutation. The former are dealt
with by adding std::move() and missing 'mutable' (in case of lambdas). The
latter are improved by storing mutation_partition externally thus removing
the need for moving mutation_partition each time mutation is moved.
Storing mutation_partition externally is obviously trading the cost of
move constructor for the cost of allocation which shows in perf_mutation
results since mutations aren't moved in that test.
perf_mutation (-c 1):
before: 3289520.06 tps
after: 3183023.37 tps
diff: -3.24%
perf_simple_query (read):
before: 526954.05 tps
after: 577225.16 tps
diff +9.54%
perf_simple_query (write):
before: 731832.70 tps
after: 734923.60 tps
diff: +0.42%
Fixes#150 (well, not completely)."
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