In fcampelo/ExpDE: Modular Differential Evolution for Experimenting with Operators

add standard alpha and beta values to BLX-alpha-beta
Document new mutation operators (like in the paper)
check error message for is_within() (see, for instance, recombination_onepoint)
Add flag record.everything to ExpDE() (to return the whole history of the optimization, incl. intermediate populations)
Consider expressing candidate solutions as lists (useful to encapsulate meta-info about each vector in the population).
Add 'offspringnumber' option to the recombination routines (to simplify reuse, e.g., for RCGAs or other extensions)
think about using a standard notation for parameters in all recombination operators (is it interesting or will it generate more confusion?)
There is a problem in the absence of verification of variables of the function, maxevals and maxiter, if they are numeric. Please look at this. Att, Valmor Ricardi Junior