QtTelnet induced crash

Actually this is a double issue and concerns QtTelnet 2.1:
When repeatedly creating (new) and deleteing (delete) QtTelnet objects while using them in between (connectToHost(), sendData(), close()) sooner or later but rather sooner a crash will result.

I decided to use new and delete because (and this is issue 2):
When going through the cycle (connectToHost(), sendData(), close()) a second cycle is not possible anymore because the sendData() doesn't work anymore.