* Simplifying SMTP Logic
This commit breaks the test email sending into it's own service method
(thus removing the capability from the API- if we want it back, we can
wire up another endpoint for just that). Additionally, error wrapping is
used through the new ModifyAppConfig service method to ensure that an
error or failed email will always result in an error while ensuring that
the submitted record always get committed (unless a serious error
happens).
* never wrap a nil error
* use err instead of individual errors
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