[Merged by Bors] - feat: functors which preserve homology#7197
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[Merged by Bors] - feat: functors which preserve homology#7197
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The notion of functor preserving homology is introduced in this PR, but the more important definitions are that of left homology data that are preserved by a certain functor
F. When it is so, a left homology datahfor a short complexSinduces a left homology datah.map FforS.map F, and the left homology(h.map F).HisF.obj h.H. (In the next PR in this series, the same shall be done for right homology data.)