Fix t.poplate(random_branches=...) to new api even in dead code.

So even for code that is not really working, now we have it with
the right way of calling it.

It was particularly important in these "interactive" tests:
  tests/test_treeview/phylotree_visualization.py
  tests/test_treeview/test_all_treeview.py

ete4/tools/ete_generate.py

@@ -1,3 +1,5 @@
+import random
+
 from .common import dump
 
 DESC = ""
@@ -13,5 +15,6 @@ def run(args):
 
     for n in range(args.number):
         t = Tree()
-        t.populate(args.size, random_branches=args.random_branches)
+        fn = random.random if args.random_branches else None
+        t.populate(args.size, dist_fn=fn, support_fn=fn)
         dump(t)

tests/test_treeview/bubble_map.py

@@ -19,7 +19,7 @@ def layout(node):
 def get_example_tree():
     # Random tree
     t = Tree()
-    t.populate(20, random_branches=True)
+    t.populate(20, dist_fn=random.random, support_fn=random.random)
 
     # Some random features in all nodes
     for n in t.traverse():

tests/test_treeview/test_all_treeview.py

@@ -1,6 +1,7 @@
 import unittest
 import sys
 import os
+import random
 
 ETEPATH = os.path.abspath(os.path.split(os.path.realpath(__file__))[0]+'/../')
 sys.path.insert(0, ETEPATH)
@@ -144,7 +145,7 @@ def layout(node):
                 faces.add_face_to_node(F2 ,node, 1, position="branch-right")
                 CONT += 1
         t = Tree()
-        t.populate(20, random_branches=True)
+        t.populate(20, dist_fn=random.random, support_fn=random.random)
         ts = TreeStyle()
         ts.layout_fn = layout
         ts.mode = "c"

tests/test_treeview/tree_faces.py

@@ -24,7 +24,7 @@ def layout(node):
 def get_example_tree():
     # Random tree
     t = Tree()
-    t.populate(20, random_branches=True)
+    t.populate(20, dist_fn=random.random, support_fn=random.random)
 
     # Some random properties in all nodes
     for n in t.traverse():