NLopt 2.6.0
New set_upper_bound
and set_lower_bound
functions in the low-level C API to set one bound at a time (#257). There is no longer a separate libnlopt_cxx library — C++ algorithms (stogo) are compiled and included by default (#198). Various build fixes (#197, #216, #245, #250, #230, #261, etc.), other fixes (#242, #258).