test of meanlz
test sampleV
test pvR
test of pvz (not of all of the special in and outputs yet
test pvT
test pvRvT
test pvTvz
test pvRvz
test different setups of quasiisothermaldf, fix bug in rg when not using precomputerg
tests of qdf's __call__
tests of qdf's vmomentdensity
tests of the different in and outputs of pvz, fix some logic in quasiisothermaldf
do not test the tplquad calculations and raise warning about them (don't want to completely remove them)