Apparently, enabling/disabling of individual radio-options was never documented, properly

git-svn-id: https://svn.code.sf.net/p/rkward/code@4890 7936002b-cd1d-0410-9ce3-d7ebf93b5162
rkwarddev: added rk.XML.option(), not implemented in other functions yet

git-svn-id: https://svn.code.sf.net/p/rkward/code@4891 7936002b-cd1d-0410-9ce3-d7ebf93b5162
Some more help fragments.
Don't show df num and df den hints for chi-sq test.
Meik, I have modified the df den hint as explained on the list. Hope that is ok with you.

git-svn-id: https://svn.code.sf.net/p/rkward/code@4892 7936002b-cd1d-0410-9ce3-d7ebf93b5162
rkwarddev: r.XML.options() should now work for rk.XML.radio(), even mixed with named vectors

git-svn-id: https://svn.code.sf.net/p/rkward/code@4893 7936002b-cd1d-0410-9ce3-d7ebf93b5162
add  a hint to the minimum required rkwarddev version. maybe rkwarddev should get its own dependency check for scripts.

git-svn-id: https://svn.code.sf.net/p/rkward/code@4894 7936002b-cd1d-0410-9ce3-d7ebf93b5162