deflate: Improve entropy compression #338
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Improve entropy coding and make various cleanups. Before: ``` file out level insize outsize millis mb/s dickens flatekp -2 1019244600 589553800 3460 280.86 dickens flatekp 1 1019244600 460143946 7778 124.96 dickens flatekp 2 1019244600 447624657 7993 121.60 dickens flatekp 3 1019244600 442275633 10105 96.19 dickens flatekp 4 1019244600 411669371 10310 94.28 dickens flatekp 5 1019244600 406856462 11506 84.48 dickens flatekp 6 1019244600 403864317 11894 81.72 dickens flatekp 7 1019244600 391734230 27703 35.09 dickens flatekp 8 1019244600 386774915 38643 25.15 dickens flatekp 9 1019244600 385598868 48084 20.21 ``` After: ``` file out level insize outsize millis mb/s dickens flatekp -2 1019244600 582799774 3812 254.97 dickens flatekp 1 1019244600 458664090 7490 129.76 dickens flatekp 2 1019244600 445420813 7872 123.47 dickens flatekp 3 1019244600 439874073 9659 100.63 dickens flatekp 4 1019244600 407860161 9766 99.52 dickens flatekp 5 1019244600 404161695 11432 85.02 dickens flatekp 6 1019244600 400997375 11605 83.75 dickens flatekp 7 1019244600 391734230 26570 36.58 dickens flatekp 8 1019244600 386774915 37690 25.79 dickens flatekp 9 1019244600 385598868 47283 20.56 ```
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Improve entropy coding and make various cleanups.
Before:
After: