if glooptest is not installed, an alias is added to equate homedecor
steel chainlinks to glooptest's, for compatibility.
The six-steel-ingot wall chain recipe is no longer to make wall chains.
Instead, if glooptest is not installed, this recipe is used to make
chain *links*.
Whether glooptest is installed or not, the steel chainlinks are still
used along with steel ingots, to make wall chains as before.
package the two together as a modpack so that regular homedecor users don't
see a functional change, but others can take signs_lib and use it as a
standalone mod.
also get rid of some *~ files
