sot is below vcl, but is a filters test, we can split bootstrapfixture
into a vcl needing bit and and non-vcl bit and filters test api
can be standalone and combined with whichever bit in order to form
pre and post vcl filters test

this is just to get my smoketest running and should be revisited.

Add a special mode where a Configuration does not deliver to the solver,
and use it in Configuration_mediawiki, preventing the files from
officecfg being overwritten by files from swext.
Should fix the annoying sc_test_filters failure and the smoketest
as well if the mediawiki extension is enabled.

First step before implementing Fade In/Out