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also merge the expected output to the *.test files.

 * the solver no longer does look-ahead locking of names
   (could be possibly optimized later); instead names are now
   always ordered strictly to properly detect the package names
   which are unsolveable
 * basic error tests added, so we can see the most likely problem
   in dependencies easily

Packages that need (re-)installation but which are not available,
are excluded now properly.