[x] think about adding another variant between AcqFunctionEHVI (k = 2) AcqFunctionEHVIGH (k > 3) that is also exact, probably not much relevant for now
[x] test diff in AcqFunctionEHVI and AcqFunctionEHVIGH once the former is stable and fixed
[x] (test w.r.t change of signs, add later)
[x] add $packages to AcqFunction due to AcqFunctionEHVIGH requiring emoa and fastGHQuad
AcqFunctionEHVI- somehow is still buggedAcqFunctionEHVI(k = 2)AcqFunctionEHVIGH(k > 3) that is also exact, probably not much relevant for nowAcqFunctionEHVIandAcqFunctionEHVIGHonce the former is stable and fixed$packagestoAcqFunctiondue toAcqFunctionEHVIGHrequiringemoaandfastGHQuad