New versions of gWidgetsRGtk2, tcltk and rJava uploaded

Basically these are minor bugfixes and documentation tweaks to make
CRAN happy. Fixes include: gframe in gWidgetstcltk and fixes to
methods for gradio, gvarbrowser and gpanedgroup in gWidgetsRGtk2. 


Future changes (hopefully) will fix up the gdf constructor in
gWidgetsRGtk2 and documentation imporvements to gWidgets itself.