artifacts before deleting temp files. :(

Also, allow tests to run as soon as jsdoor is done, and don't use
the artifact file, use the local copy instead.

Only on freebsd-amd64 now though... no need to leave stuff laying
everywhere.

hoping this doesn't leave an empty zip file laying aorund.

This allows each call to ftp_remote() to specify the log level for any remove
failure. All others file-removal failures will continue to log at ERROR level.

I get this particular (harmless) error a lot, so just reducing to warning:
ftp  ... !ERROR 13 (Permission denied) (line 860) removing file: path/to/*.qwk

This basically just moves the download of sbbs-build from the test
phase to the build phase, so shouldn't result in any speedup.

This will allow sbbs-build to run in parallel with scfg etc.

About ten seconds in extract/patch, two minutes in build.

Allows caching in gitlab.