Allow load to finish but flag it as failed anyway (with exit code) [Zsolt]

[tznind]

Is your feature request related to a problem? Please describe.
For some attachers e.g. xml loading sci store you want to load the data and report bad data. But a warning gives an error code of 0 (passed).

Describe the solution you'd like
Add an indeterminate sort of error code where the load completes but is still marked as a fail at the end.