* src/reader.h: New file.

Propagate its use instead of tedious list of `extern' and
prototypes.
* src/reader.c: Formatting changes, topological sort,
s/register//.

src/lalr.h

@@ -21,6 +21,11 @@
 #ifndef LALR_H_
 # define LALR_H_
 
+
+/* Import the definition of CORE, SHIFTS and REDUCTIONS. */
+# include "state.h"
+
+
 /* Compute how to make the finite state machine deterministic; find
    which rules need lookahead in each state, and which lookahead
    tokens they accept.  */