SG Craft

Stargates will now preferentially draw power from a power unit instead of using naquadah if both are available.
Generic recipe now available for RF power unit when Thermal Expansion not installed.
SG Craft items now have their own creative tab.
Computer API calls no longer raise exceptions on error, but return nil and an error message. This brings the API more into line with Lua programming conventions and avoids some incompatibilities between Computercraft and Open Computers concerning formatting of error messages. See the note on Error Handling in the documentation for a way to adapt your existing code.
Added German language file (contributed by Timmy94W)