fix: stg import --reject should create empty commit #472
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When trying to import a patch that does not apply cleanly, and using --reject option, stg should apply what it can, leave the rest in .rej files, and create an empty commit. The work to apply the patch is outsourced to "git apply --reject" which exits with status code 1 if patch is applied partially and it is treated as error by stg import.
Fix the issue by treating exit codes less than 128 from "git apply --reject" as success (128 signals hard error).
Also add a test case and fix up documentation for "stg import".
Closes: #471