Added crafting recipes for various objects, with options: If homedecor is

Added crafting recipes for various objects, with options:  If homedecor is
installed, use the plastic sheeting therein.  If not, we define it manually.
If the Technic mod is installed, don't define any recipes at all.  Also removed
the extra "loaded!" messages and tweaked the default pipe alias to point to
something that is actually visible :-)