TODO: updated tasks
helpers, cluda/kernel: creating a Template in a single place now
cluda/kernel: added a proper discovery protocol for modules and snippets
test/pytest_threadgen: moved reikna import inside a function so that it does not spoil coverage results
cluda: added ``strides`` keyword to array creation functions
cluda/kernel: using Singature objects instead of ArgSpec for snippet functions
cluda/tempalloc: using named tuples instead of AttrDict