- changed literal syntax to use the convert notation

- fixed issued with function declarations/function literals
- added more tests and fixed existing tests

SVN=118167

test/float_lit.go

@@ -7,7 +7,8 @@
 package main
 
 func main() {
-  [ 0.,
+  []float(
+    0.,
     +10.,
     -210.,
         
@@ -66,5 +67,5 @@ func main() {
     0.0E123,
     +10.01e234,
     -210.012e345
-  ]
+  );
 }