If a 'zip-excludes.lst' file is found in the craft's base directory, that will
overwrite the global catalog exclusion list.
Three new unit tests have been created to test the functionality.
Support multiple primary aircraft in a package, which has several
aircraft developers have requested. This adjusts the handling of
the variant-of and primary-set tags.
Additionally, this adds partial unit-test coverage for -set.xml
scanning and catalog XML generation.
Run ./test_catalog to run unit-tests of the catalog generation.
- extract per-variant thumbnails from -set.xml files
- handle multiple primary aircraft in a directory (this will
need client-side changes too, eventually)
This restores the ability to use includes in -set.xml files visible
to the catalog code, and also exposes some problems / validation
issues in our -set.xml files. (Which can of course be fixed)
