Also get rid of the kernel/messages subdirectory.

- Separate allocation and uploading of textures.
- Move common code for allocating, uploading and downloading textures
  into separate functions.
- Set the correct format and type for DXT textures.

FILE_GetDeviceInfo needs to be efficient, and IOKit is much too slow
to be used here.

makefiles: List bison dependencies explicitly for parallel makes, since older bisons don't support --defines.

Only include test revision information in the distributed binary.

and so there aren't enough blocks in the chain to write data into.

returning error codes to the caller and by handling the error
condition.