Remove unused variable in lib/bio/util/contingency_table

This commit removes below interpreter warning.

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

This commit removes below interpreter warning.

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

This commit removes below interpreter warning.

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

This commit removes below interpreter warning.

* warning: mismatched indentations at ...
Fix indent in test/unit/bio/sequence/test_dblink

This commit removes below interpreter warning.

* warning: mismatched indentations at ...
Remove unused variable in test/unit/bio/db/embl/test_embl

This commit removes below interpreter warning.

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

This commit removes below interpreter warning.

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

This commit removes below interpreter warning.

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

This commit removes below interpreter warning.

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

This commit removes below interpreter warning.

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

This commit removes below interpreter warning.

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

This commit removes below interpreter warning.

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

This commit removes below interpreter warning.

* 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