Add superimposition method for homologous sequences #587
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This PR adds two superimposition methods:
superimpose_without_outliers()allows superimposition with iterative outlier removal to decrease the RMSD of the remaining atoms.superimpose_homologs()finds corresponding atoms via sequence alignment and runssuperimpose_without_outliers()afterwards. This function is quite robust for simply superimposing similar proteins/nucleic acidsto_sequence()is also added, primarily to get the sequences forsuperimpose_homologs()