more matching functions
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matching after Gaëtan's comments
matching: doc and changelog

No test because, there is nothing to do except adding other matching
options in simulation.yml
add arguments to the function in loop_wh_progress
add a pool_size parameter in matching function

Oops, there is something wrong with change/version_0_8_2.rst, I'll fix
it in an incoming commit.
matching changes
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