Fix indent in lib/bio/map

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Remove unused variable in lib/bio/pathway

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* warning: assigned but unused variable
Rename unused variable in lib/bio/tree

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* warning: assigned but unused variable
Rename unused variable in lib/bio/util/contingency_table

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* warning: assigned but unused variable
Fix indent in test/unit/bio/appl/test_blast

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* warning: mismatched indentations at ...
Fix indent in test/unit/bio/db/genbank/test_genbank

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Fix indent in test/unit/bio/db/test_phyloxml

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Fix indent in test/unit/bio/sequence/test_dblink

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Remove unused variable in test/unit/bio/db/embl/test_embl

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* warning: assigned but unused variable
Remove unused variable in test/unit/bio/db/embl/test_embl_rel89

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* warning: assigned but unused variable
Remove unused variable in test/unit/bio/db/embl/test_sptr

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* warning: assigned but unused variable
Remove unused variable in test/unit/bio/db/test_gff

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* warning: assigned but unused variable
Remove unused variable in test/unit/bio/db/test_phyloxml_writer

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* warning: assigned but unused variable
Remove unused variable in test/unit/bio/io/flatfile/test_splitter

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* warning: assigned but unused variable
Remove unused variable in test/unit/bio/sequence/test_na

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* warning: assigned but unused variable
Remove unused variable in test/unit/bio/appl/bl2seq/test_report

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* warning: assigned but unused variable
Remove unused variable in test/unit/bio/appl/blast/test_report.rb

This commit removes below interpreter warning.

* warning: assigned but unused variable