[Qtitools-mathassess] Minibix with test support

[Dan S. <dan...@ca...>]

Minibix has now been updated to allow uploading, downloading, and 
searching for tests, and is live.

Please check that the existing facilities still work, particularly test 
uploading via the webservice (MathAssess).

The mechanism is exactly the same as for items. Minibix detects a test 
from its metadata and routes it appropriately. The deposit type (if 
specified) is not "imscp" but "test". I'll just work through a manual 
webservice example, and forward the info shortly.

Dan.