Merged repackaged. NVDA is now distributed as one stand-alone executable which provides the ability to install or create a portable copy at any time. Specifically:
* scons launcher will produce one executable that when run will: start a temporary copy of NVDA, and show a dialog that will allow to install NVDA, create a portable copy, or continue running.
* A portable version of NVDA can now be installed by choosing Install NVDA under Tools in the NVDA menu.
* an installed version of NVDA can create a portable copy by choosing Create Portable Copy under Tools in the NVDA menu.