defs.py.sample: DIR_GERMLINE was not explained

Fix 223c9a49

server/web2py/applications/vidjil/modules/defs.py.sample

@@ -39,6 +39,10 @@ BASENAME_OUT_VIDJIL_ID = '%06d'
 DIR_VIDJIL = '../../'
 DIR_FUSE = '../../tools'
 DIR_MIXCR = '../../'
+
+### Directory that store the germlines used by Vidjil
+DIR_GERMLINE = DIR_VIDJIL + 'germline/'
+
 ### Port on which to run the fuse server
 ### Used in models/task.py and in /server/fuse_server.py
 PORT_FUSE_SERVER = 12789