create missing profiles by default in qtconsole

Since most apps now create profiles by default, perhaps the base Application
default should be switched to True, and only those apps that *don't*
should override defaults with auto_create=False

IPython/frontend/qt/console/qtconsoleapp.py

@@ -257,6 +257,8 b' class IPythonQtConsoleApp(BaseIPythonApplication):'
 
     kernel_argv = List(Unicode)
 
+    # create requested profiles by default, if they don't exist:
+    auto_create = CBool(True)
     # connection info:
     ip = Unicode(LOCALHOST, config=True,
         help="""Set the kernel\'s IP address [default localhost].