Merge branch 'release/0.6.1' into develop
Next version is 0.6.2
algorithms/reduce: using floordiv instead of truediv
doc/history: added information about the fixed issue
algorithms/pureparallel: changed from_trf() logic to avoid usage of 'io' parameters.
TODO: updated
fft.mako: ensure that all local barriers are reached by every thread, otherwise it's UB in some OpenCL platforms

Fixes #10
cluda/functions: added pow()
test/cluda/functions: casting output array to the expected type because numpy tends to promote types
cluda/functions: added explicit complex constructor to the output constant in pow()
cluda/api_discovery: rearranged the order of available APIs

The OpenCL one is in general more reliable.
cluda/api_discovery: added any_api() function
Added a struct reduction example
TODO: updated
TODO: moved tasks (need to release 6.2)
doc/source/conf: updated the copyright message
doc/source: removed the link to the development documentation

It is not really useful, anyway.
v0.6.2 released
Merge branch 'release/0.6.2'