| TAOLINESEARCH_FAILED_INFORNAN | - function evaluation gives Inf or Nan value
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| TAOLINESEARCH_FAILED_BADPARAMETER | - negative value set as parameter
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| TAOLINESEARCH_FAILED_ASCENT | - initial line search step * g is not descent direction
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| TAOLINESEARCH_HALTED_MAXFCN | - maximum number of function evaluation reached
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| TAOLINESEARCH_HALTED_UPPERBOUND | - step is at upper bound
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| TAOLINESEARCH_HALTED_LOWERBOUND | - step is at lower bound
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| TAOLINESEARCH_HALTED_RTOL | - range of uncertainty is smaller than given tolerance
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| TAOLINESEARCH_HALTED_USER | - user can set this reason to stop line search
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| TAOLINESEARCH_HALTED_OTHER | - any other reason
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| TAOLINESEARCH_SUCCESS | - successful line search
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