Add an internal parameter "outer_mineval_xftol" for mma/ccsaq. #594
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In mma/ccsaq, when the outer iteration step k is less than "outer_mineval_xftol", the stopping criteria of xtol and ftol are disabled. This is quite useful in some optimization problems where there is a "startup" process during which x and f change slowly. The default value of "outer_mineval_xftol" is 0, namely the program behavior is the same with that of the current version.