Chicken: a few bug fixes, a new example and some new test suite runme, and some doc updates

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk/SWIG@7143 626c5289-ae23-0410-ae9c-e8d60b6d4f22

Examples/chicken/egg/test.scm

@@ -0,0 +1,18 @@
+(require-extension single)
+(require-extension multi)
+
+(define f (make <Foo>))
+(slot-set! f 'a 3)
+(print (slot-ref f 'a))
+
+(define b (make <Bar>))
+(slot-set! b 'b 2)
+(print (slot-ref b 'b))
+
+(define b2 (make <Bar2>))
+(slot-set! b2 'b 4)
+(slot-set! b2 'c 6)
+(print (slot-ref b2 'b))
+(print (slot-ref b2 'c))
+
+(exit 0)