gnu: proteinortho: Add tunable property.

* gnu/packages/bioinformatics.scm (proteinortho)[properties]: Add
tunable? flag.

Change-Id: If59d5785c8c8e4aedb5b88479da6fba0e9754640

gnu/packages/bioinformatics.scm

@@ -9043,6 +9043,7 @@ predicts the locations of structural units in the sequences.")
 species.  For doing so, it compares similarities of given gene sequences and
 clusters them to find significant groups.  The algorithm was designed to handle
 large-scale data and can be applied to hundreds of species at once.")
+    (properties `((tunable? . #t)))
     (license license:gpl3+)))
 
 (define-public prodigal