ENH add multiple data at the same time if data is a list (#514)

* ADD add multiple data at the same time if data is a list

* DOC update docstring

Author: Matlmr

cortex/segment.py

@@ -144,8 +144,9 @@ def cut_surface(cx_subject, hemi, name='flatten', fs_subject=None, data=None,
         Which hemisphere to flatten. Should be "lh" or "rh"
     name : str, optional
         String name of the current flatten attempt. Defaults to "flatten"
-    data : Dataview
-        A data view object to display on the surface as a cutting guide.
+    data : Dataview or List(Dataview)
+        A data view object or list of data view objects to display on the 
+        surface as a cutting guide.
     fs_subject : str
         Name of Freesurfer subject (if different from pycortex subject)
         None defaults to `cx_subject`
@@ -182,7 +183,11 @@ def cut_surface(cx_subject, hemi, name='flatten', fs_subject=None, data=None,
         blender.fs_cut(fname, fs_subject, hemi, freesurfer_subject_dir)
     # Add localizer data to facilitate cutting
     if data is not None:
-        blender.add_cutdata(fname, data, name=data.description)
+        if isinstance(data, list):
+            for d in data:
+                blender.add_cutdata(fname, d, name=d.description)
+        else:
+            blender.add_cutdata(fname, data, name=data.description)
     if blender_cmd is None:
         blender_cmd = options.config.get('dependency_paths', 'blender')
     # May be redundant after blender.fs_cut above...