fixed several problems:

- hex numbers and floating point numbers were wrong
- grammar was wrong; did not accept correct ANSI C
- prototype updates did not work
- float parameters to routines without prototype were not upgraded to double
- the dot operator no longer requires lvalue as left-hand-side

lang/cem/cemcom.ansi/program.g

@@ -138,7 +138,6 @@ external_definition
 			';'
 		]
 	|
-		empty
 		{do_decspecs(&Ds);}
 		declarator(&Dc)
 		{