First step towards generalising BOSS kernel objects

Yuhao Zhangrequested to merge
kwd_agnostic_kernels into master

get_all_params() kwd agnostic. Gets values directly grom GPy kernel objects allowing future cases where user may define their own kernel object to be passed into BOSS in which case get_all_params will be ready to accept such change with little modifications. Also writes column header names in RST files for xy and each hyperparam values using new RST function which relies on new get_all_params().

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