As a user, I want to import a pre-existing CTML for further editing process

[jagnathan]

As a user, I want to import a pre-existing CTML for further editing process

Sometimes CTMLs are created by manual editing or through an automated process.

As a user, I would like to continue editing the CTML in the CTIMS editor.

When I want to import the CTML,
If there are any issues during import, a warning message should appear so that the CTML can be fixed to correct the warnings.
If there are any errors during import, an error message should appear so that the CTML can be fixed to correct the errors.

If there are any fields that are in the CTML, that are not in the CTIMS editor, a warning message has to be shown.

I should be able to import CTML one after another without any issues (if there are no errors in the CTML file).