Clean and fix definitions of options.

- Provide new helper functions in `Goptions` on the model of
  `declare_bool_option_and_ref`;

- Use these helper functions in many parts of the code base
  (encapsulates the corresponding references);

- Move almost all options from `declare_string_option` to
  `declare_stringopt_option` (only "Warnings" continue to use the
  former).  This means that these options now support `Unset` to get
  back to the default setting.  Note that there is a naming
  misalignment since `declare_int_option` is similar to
  `declare_stringopt_option` and supports `Unset`.  When "Warning" is
  eventually migrated to support `Unset` as well, we can remove
  `declare_string_option` and rename `declare_stringopt_option` to
  `declare_string_option`.

- For some vernac options and flags that have an equivalent
  command-line option or flag, implement it like the standard `-set`
  and `-unset`.

1 files changed, 1 insertions, 3 deletions

diff --git a/printing/printer.mli b/printing/printer.mli
index 936426949c..8c633b5e79 100644
--- a/printing/printer.mli
+++ b/printing/printer.mli
@@ -19,9 +19,7 @@ open Notation_term
 
 (** These are the entry points for printing terms, context, tac, ... *)
 
-val enable_unfocused_goal_printing: bool ref
-val enable_goal_tags_printing      : bool ref
-val enable_goal_names_printing     : bool ref
+val print_goal_tag_opt_name : string list
 
 (** Terms *)