style: comment and formatting changes, and fixes

* examples/c/lexcalc/parse.y: Fix option handling.
* src/gram.h: Clarify comments.
* src/ielr.c: Fix indentation.
* src/print.c, src/state.h: More comments.

src/print.c

@@ -43,6 +43,8 @@
 #include "symtab.h"
 #include "tables.h"
 
+/* For a given state, the symbol numbers of the lookahead tokens for
+   shifts and errors (i.e. not reduce).  */
 static bitset no_reduce_set;