LAK: Explicit cast to np.array isn't preserved (#385)
LAK: Explicit cast to np.array isn't preserved (#385)

* Explicit cast to np.array isn't preserved

* Fixes issue in LAK package _init_ routines when only a single lake is active

* Previous alteration worked for one lake, but didn't handle one stage for multiple lakes.  This should account for that condition

aleaf/flopy,jentjr/flopy,jentjr/flopy,aleaf/flopy