deleted a redundant functions
added more flexibility to check_optimum wrt plotting
updated drawing of parameters

Now one can draw from the prior, the mode or the posterior distribution.
In addition, one can get both the drawn parameter vector and the object
in which the parameter vector has been pushed
moved recenter to utilities folder
deleted unnecessary files
get function augmented to fetch mode, mean, median, etc.
removed print_estimates (in connection with get)
Solving of alternatives updated to conform with Alpha version
Printing of derivatives crashed in large models. Corrected
missing structure added in priors setup
updated set function for calibration
setup calibration now accepting both structures and cell
Separate function for initialization of solution
Disabled an m-lint warning to make the code green