Added building helpers for try/finally nodes
Added building helpers for try/finally nodes

* This handles building the statement sequences from single statements
  transparently

* As we are going to have a lot of these, this can help to keep the
  code simpler.

tempbottle/Nuitka,kayhayen/Nuitka,wfxiang08/Nuitka,tempbottle/Nuitka,wfxiang08/Nuitka,kayhayen/Nuitka,tempbottle/Nuitka,wfxiang08/Nuitka,tempbottle/Nuitka,kayhayen/Nuitka,kayhayen/Nuitka,wfxiang08/Nuitka