A new infrastructure for warnings.

On the user side, coqtop and coqc take a list of warning names or categories
after -w. No prefix means activate the warning, a "-" prefix means deactivate
it, and "+" means turn the warning into an error. Special categories include
"all", and "default" which contains the warnings enabled by default.

We also provide a vernacular Set Warnings which takes the same flags as argument.

Note that coqc now prints warnings.

The name and category of a warning are printed with the warning itself.

On the developer side, Feedback.msg_warning is still accessible, but the
recommended way to print a warning is in two steps:

1) create it by:

let warn_my_warning =
  CWarnings.create ~name:"my-warning" ~category:"my-category"
    (fun args -> Pp.strbrk ...)

2) print it by:

warn_my_warning args

1 files changed, 2 insertions, 6 deletions

diff --git a/ide/session.ml b/ide/session.ml
index cdec392ec..e99833760 100644
--- a/ide/session.ml
+++ b/ide/session.ml
@@ -195,12 +195,8 @@ let set_buffer_handlers
          to a point indicated by coq. *)
       if !no_coq_action_required then begin
         let start, stop = get_start (), get_stop () in
-        buffer#remove_tag Tags.Script.error ~start ~stop;
-        buffer#remove_tag Tags.Script.error_bg ~start ~stop;
-        buffer#remove_tag Tags.Script.tooltip ~start ~stop;
-        buffer#remove_tag Tags.Script.processed ~start ~stop;
-        buffer#remove_tag Tags.Script.to_process ~start ~stop;
-        buffer#remove_tag Tags.Script.incomplete ~start ~stop;
+	List.iter (fun tag -> buffer#remove_tag tag ~start ~stop)
+		  Tags.Script.ephemere;
         Sentence.tag_on_insert buffer
       end;
     end in