Revert "ENH: enable USE_TYPED_DSET and convert all dsets to it" #215

Job	Run time
clang-format formatting check	12s
Scripts Check	11s
Ub-20 gcc-9 + MinGW	12m 37s
clang-tidy checks	7m 1s
Ub-20 gcc-9 C++14, static	6m 50s
Ub-20 gcc-9 C++03, static	6m 44s
Ub-20 clang-10 C++14	5m 58s
Ub-20 gcc-9 + RT-5.1 beatnik	10m 37s
Ub-20 clang-10 C++03	6m 1s
MacOS clang-12	3m 50s
Win2019 MinGW	13m 44s
	1h 13m 45s

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