dependency is not a wildcard.

Related: #110

Also fixes treatment for self-dependencies in wildcards (closes #111).

Among other things, passing fixed parameters can improve the accuracy
of temp shape inference, so that fallback can occur less often.

The motivation for this is to remove the temp_shape_fallback warnings
when constructing sumpy kernels.

cacheable before creating the cache key.

get included in dependency calculcations.

Add a save and reload test that uses base_storage.

array prefixes as they are aded to the set.

Closes #25 on gitlab
Depends on inducer/pytools!2 on gitlab

type. Now, the argument to a reduction can be either a scalar or a
tuple.