new Basque translation. John

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/rcmdr@503 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Basque translation. John

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/rcmdr@504 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
added model effects plot dialog; other small changes to accommodate it. John

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/rcmdr@505 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
added span slider to effect-plots dialog. John

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/rcmdr@506 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
check loading of rJava before installing Excel import menu item on 64-bit Windows. John

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/rcmdr@507 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
added option to change ttk theme. John

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/rcmdr@508 edb9625f-4e0d-4859-8d74-9fd3b1da38cb