kinsolInterface::initialize leaks if called multiple times

[mcneish1]

LS and J are leaked upon successive calls to kinsolInterface::initialize. Additionally, KINInit leaks if called more than once for a given solverMem.

KINInit should be only called when !flags[initialized_flag], and LS/J should be freed here (or in sundialsInterface::allocate, where that happens with the other variables sundialsInterface manages).