Add R keyword support. Rename keywords for successful compilation of Java and C# code. More consistent keyword warnings across the different languages.

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk@10530 626c5289-ae23-0410-ae9c-e8d60b6d4f22

Lib/r/r.swg

@@ -12,6 +12,8 @@
 SWIGEXPORT void SWIG_init(void) {
 %}
 
+%include <rkw.swg>
+
 #define %Rruntime %insert("s")
 
 #define SWIG_Object SEXP

Lib/r/rkw.swg

@@ -0,0 +1,17 @@
+/*
+  Warnings for R keywords, built-in names and bad names.
+*/
+
+#define RKW(x) %keywordwarn("'" `x` "' is a R keyword, renaming to '_" `x`"'", rename="_%s")  `x`
+
+
+/*
+  Warnings for R keywords 
+  REFERENCE ????
+*/
+
+RKW(except);
+RKW(in);
+RKW(next);
+
+#undef RKW