further worked on the teapot drawing code:

cleaned up some debug stuff, and generalized the code
now added teacup and teaspoon too, so we have Newell's set complete
As source attribution, i copied in the whole original email message that the data was taken from, and where i downloaded that email message
fixed z offset as well, so all three objects now drawn centered

git-svn-id: svn+ssh://svn.code.sf.net/p/freeglut/code/trunk/freeglut/freeglut@1569 7f0cb862-5218-0410-a997-914c9d46530a