update agopenTrue hacks

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/gridgraph@40 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
update agopenTrue man page

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/gridgraph@41 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
small changes to comments in methods.R

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/gridgraph@42 edb9625f-4e0d-4859-8d74-9fd3b1da38cb