Allow lang version setting with LOOPY_KERNEL_LANGUAGE_VERSION global in make_kernel caller's global space

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.