Fixing bug7: bad predictions from fit with poly() by ensuring terms objects contain predvars attribute

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/ordinal@150 dd220844-296b-48bf-b704-e9ffb8426404
correcting spelling error

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/ordinal@151 dd220844-296b-48bf-b704-e9ffb8426404
merged latest pkg/ordinal changes into predict-bug branch

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/ordinal@152 dd220844-296b-48bf-b704-e9ffb8426404