Fix "Error in strsplit(object@Formula, "~") : non-character argument" error when model formula is specified as a formula object.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/r2mlwin@84 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Set ACF/PACF graph axis range to between zero and one.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/r2mlwin@85 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Use column name for parameter if not explicitly set when calling the function.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/r2mlwin@86 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Correct typo.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/r2mlwin@87 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Set default of NULL for indata, and provide error message if it isn't set.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/r2mlwin@88 edb9625f-4e0d-4859-8d74-9fd3b1da38cb