add size_hint to Probe.set_options(), fix refinement for multiple calls
add size_hint to Probe.set_options(), fix refinement for multiple calls

- new Probe.reset_refinement() - called in .probe()

rc/sfepy,vlukes/sfepy,lokik/sfepy,rc/sfepy,lokik/sfepy,sfepy/sfepy,RexFuzzle/sfepy,lokik/sfepy,BubuLK/sfepy,sfepy/sfepy,RexFuzzle/sfepy,rc/sfepy,RexFuzzle/sfepy,RexFuzzle/sfepy,vlukes/sfepy,lokik/sfepy,BubuLK/sfepy,sfepy/sfepy,vlukes/sfepy,BubuLK/sfepy