Allocations and slow perf for Transform! on GroupedDataFrames

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Thank you very much for reporting. Mostly fixed in fix performance issue in multirow split-apply-combine by bkamins · Pull Request #2749 · JuliaData/DataFrames.jl · GitHub (maybe it still can be improved but the major sources of problems are solved):

julia> @btime test1($df1);
  890.798 μs (556 allocations: 7.66 MiB)

julia> @btime test1($dfg1);
  25.061 ms (65066 allocations: 54.79 MiB)
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