Jure: thanks for finding a memory leak in KStars!

Unfortunately, your fix was not correct, because we set "pLast = pThis" prior to your "delete pThis". Therefore, pLast would be a null pointer when we still need it.

Instead, I have made pThis and pLast normal objects, rather than pointers. James, can you review this patch? I am in the midst of a large set of changes ATM, so my local copy is not compilable.