Major changes: new models and warnings
Addition of five models using the Ricker stock-recruitement equation to describe the function CPUE = f(V). Addition of warning when the noteworthy values of MSY and/or MSE are negative or associated to extremely large confidence intervals. Increase of the maximum number of iterations in the Marquardt algorithm (from 100 to 150). Improvement of plots MSY = f(V) et MSE = f(V) with minimum value set to zero and prevention of plots when all values are negative. Addition of the fitted curves on the plots CPUE = f(V) and Y = f(V). Increase of the limit range of effort variation from 40% to 100%. Increase of the range intervals of parameter c of the generalized model for shifting to the Fox or Graham-Schaefer model. Initially 0.8-1.2 and 1.8-2.2 respectively. Now 0.6-1.4 and 1.6 to 2.5 respectively. Improvement of the answers when the software failled to find a convenient model (now more precise reason are provided). Addition of warnings when contradiction are found between answers to different questions regarding the status of the stock and the results of the model regarding the level of exploitation. Improvement of the caption on figures MSY = f(V) and MSE = f(E).