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Specify optional argument --corpus-weights=filename.tsv to input the weights
The new optional input file should be in TSV format and better to have 2 columns. But it's ok for it to have more or fewer columns, if fewer, then the corpus weight will not be specify and set to 1.0, if more, then >2 columns will not be read.
It's also not necessary for each PubMed ID that occur in the "documents.tsv" to appear in this corpus weights file (not appear PubMed ID's corpus weight will be set to 1.0).
Fix the standard copy constructor of Document Class