limit rain self collection until checks for concentrations are added to

the time-splitting loop

src/common/micro/mode_lima_tendencies.F90

@@ -576,6 +576,8 @@ IF ((.NOT. LKHKO) .AND. NMOM_R.GE.2) THEN
                                     P_CR_SCBU            )
    !
    P_CR_SCBU(:) = P_CR_SCBU(:) * ZPF1D(:)
+   ! process limited until checks on concentrations are added to the time-splitting loop
+   P_CR_SCBU(:) = MAX(P_CR_SCBU(:),-0.5*PCRT(:)/PTSTEP)
    !
    PA_CR(:) = PA_CR(:) + P_CR_SCBU(:)
 END IF