move profile folder to application support on osx

this works around the data loss sierra's
icloud drive can cause

aqt/profiles.py

@@ -69,6 +69,7 @@ class ProfileManager(object):
             self.base = os.path.abspath(base)
         else:
             self.base = self._defaultBase()
+            self.maybeMigrateFolder()
         self.ensureBaseExists()
         # load metadata
         self.firstRun = self._loadMeta()
@@ -95,6 +96,17 @@ issue, please see the documentation for information on running Anki from \
 a flash drive.""" % self.base)
             raise
 
+    # Folder migration
+    ######################################################################
+
+    def maybeMigrateFolder(self):
+        if not isMac:
+            return
+        oldBase = os.path.expanduser("~/Documents/Anki")
+        if not os.path.exists(self.base) and os.path.exists(oldBase):
+            os.rename(oldBase, self.base)
+            os.symlink(self.base, oldBase)
+
     # Profile load/save
     ######################################################################
 
@@ -217,7 +229,7 @@ and no other programs are accessing your profile folders, then try again."""))
                 loc = QDesktopServices.storageLocation(QDesktopServices.DocumentsLocation)
             return os.path.join(loc, "Anki")
         elif isMac:
-            return os.path.expanduser("~/Documents/Anki")
+            return os.path.expanduser("~/Library/Application Support/Anki2")
         else:
             # use Documents/Anki on new installs, ~/Anki on existing ones
             p = os.path.expanduser("~/Anki")