Updated tabfreq, tabfreq.svy, and tabglm. Added z test for equal proportions for 2x2 tabfreq, a few choices for statistical tests for tabfreq.svy, and better confidence interval options for tabglm. 

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/tab@28 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Very minor documentation fix.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/tab@29 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Removed ci.method input and replaced it with inference input, for tabglm and tabglm.svy. Also fixed up some spacing issues in accordance with Google style guide.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/tab@30 edb9625f-4e0d-4859-8d74-9fd3b1da38cb