using traitlets.config.get_config() in python config file breaks load_config_file

I put these lines at the top of a python config file:

from traitlets.config import get_config

c = get_config()


I did this so my editor would stop bugging me about c or get_config not being defined.

Unfortunately, this subtly broke load_config_file, because that sets up global with `get_config` and `c`, both of which I just accidentally destroyed.

I suggest that in the comments that are automatically generated when generate_config_file is used, a very explicit warning be placed to guard against this. Or perhaps there's some way to check if get_config or c has been mangled/modified accidentally

Begin by tracing generate_config_file and load_config_file, focusing on how the generated Python configuration defines get_config and c. Check the generated comments and the configuration-loading behavior when those names are imported or reassigned. Done means the accidental overwrite is clearly guarded against and the affected loading behavior is covered by a regression test.

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