Remove nonworking phone_home functionality.

Nice, but would need a total remake of it for ete4, including from
the server side.

ete4/core/tree.pyx

@@ -2009,7 +2009,3 @@ cdef class Tree(object):
                     ete_node.add_child(ete_ch)
                     all_nodes[ch] = ete_ch
             return ete_ch.root
-
-    def phonehome(self):
-        from .. import _ph
-        _ph.call()

ete4/treeview/qt_gui.py

@@ -10,10 +10,6 @@
 from ..utils import random_color
 from .qt_render import render
 from .node_gui_actions import NewickDialog
-try:
-    from .._ph import new_version
-except Exception:
-    pass
 
 
 class _SelectorItem(QGraphicsRectItem):
@@ -59,24 +55,6 @@ def a_wrapper_accepting_arguments(*args, **kargs):
         print(time.time() - t1)
     return a_wrapper_accepting_arguments
 
-class CheckUpdates(QThread):
-    def run(self):
-        try:
-            current, latest, tag = new_version()
-            if tag is None:
-                tag = ""
-            msg = ""
-            if current and latest:
-                if current < latest:
-                    msg = "New version available (rev%s): %s More info at http://etetoolkit.org." %\
-                        (latest, tag)
-                elif current == latest:
-                    msg = "Up to date"
-
-            self.emit(SIGNAL("output(QString)"), msg)
-        except Exception:
-            pass
-
 class _GUI(QMainWindow):
     def _updatestatus(self, msg):
         self.main.statusbar.showMessage(msg)
@@ -128,11 +106,6 @@ def __init__(self, scene, *args):
 
         self.view.fitInView(0, 0, self.scene.sceneRect().width(), 200, Qt.AspectRatioMode.KeepAspectRatio)
 
-        # Check for updates
-        self.check = CheckUpdates()
-        #self.check.start()
-        #self.connect(self.check, SIGNAL("output(QString)"), self._updatestatus)
-
     @QtCore.pyqtSlot()
     def on_actionETE_triggered(self):
         try: