gnu: Add roary.

* gnu/packages/bioinformatics.scm (roary): New variable.

gnu: Add raxml.

* gnu/packages/bioinformatics.scm (raxml): New variable.

gnu: Add prank.

* gnu/packages/bioinformatics.scm (prank): New variable.

gnu: Add exonerate.

* gnu/packages/bioinformatics.scm (exonerate): New variable.

gnu: Add bppsuite.

* gnu/packages/bioinformatics.scm (bppsuite): New variable.

gnu: Add bpp-popgen.

* gnu/packages/bioinformatics.scm (bpp-popgen): New variable.

gnu: Add bpp-phyl.

* gnu/packages/bioinformatics.scm (bpp-phyl): New variable.

gnu: Add bpp-seq.

* gnu/packages/bioinformatics.scm (bpp-seq): New variable.

gnu: Add bpp-core.

* gnu/packages/bioinformatics.scm (bpp-core): New variable.

gnu: Add mcl.

* gnu/packages/machine-learning.scm (mcl): New variable.

gnu: Add perl-env-path.

* gnu/packages/perl.scm (perl-env-path): New variable.

gnu: Add perl-test-files.

* gnu/packages/perl.scm (perl-test-files): New variable.

gnu: Add perl-array-utils.

* gnu/packages/perl.scm (perl-array-utils): New variable.

gnu: Add perl-file-grep.

* gnu/packages/perl.scm (perl-file-grep): New variable.

gnu: Add perl-file-path.

* gnu/packages/perl.scm (perl-file-path): New variable.

gnu: Add perl-file-slurper.

* gnu/packages/perl.scm (perl-file-slurper): New variable.

gnu: Add perl-graph-readwrite.

* gnu/packages/xml.scm (perl-graph-readwrite): New variable.

gnu: Add perl-graph.

* gnu/packages/perl.scm (perl-graph): New variable.

gnu: Add perl-parse-yapp.

* gnu/packages/perl.scm (perl-parse-yapp): New variable.

gnu: Add perl-xml-writer.

* gnu/packages/perl.scm (perl-xml-writer): New variable.