Drop '.' from CErrors.anomaly, insert it in args

As per https://github.com/coq/coq/pull/716#issuecomment-305140839

Partially using
```bash
git grep --name-only 'anomaly\s*\(~label:"[^"]*"\s*\)\?\(Pp.\)\?(\(\(Pp.\)\?str\)\?\s*".*[^\.!]")' | xargs sed s'/\(anomaly\s*\(~label:"[^"]*"\s*\)\?\(Pp.\)\?(\(\(Pp.\)\?str\)\?\s*".*\s*[^\.! ]\)\s*")/\1.")/g' -i
```
and
```bash
git grep --name-only ' !"' | xargs sed s'/ !"/!"/g' -i
```
The rest were manually edited by looking at the results of
```bash
git grep anomaly | grep '\.ml' | grep -v 'anomaly\s*\(~label:"[^"]*"\s*\)\?\(Pp\.\)\?(\(\(Pp.\)\?str\)\?\s*".*\(\.\|!\)")' | grep 'anomaly\($\|[^_]\)' | less
```

1 files changed, 2 insertions, 2 deletions

diff --git a/plugins/extraction/modutil.ml b/plugins/extraction/modutil.ml
index 60fe8e7620..b67b9931ec 100644
--- a/plugins/extraction/modutil.ml
+++ b/plugins/extraction/modutil.ml
@@ -19,7 +19,7 @@ open Mlutil
 let rec msid_of_mt = function
   | MTident mp -> mp
   | MTwith(mt,_)-> msid_of_mt mt
-  | _ -> anomaly ~label:"extraction" (Pp.str "the With operator isn't applied to a name")
+  | _ -> anomaly ~label:"extraction" (Pp.str "the With operator isn't applied to a name.")
 
 (*s Apply some functions upon all [ml_decl] and [ml_spec] found in a
    [ml_structure]. *)
@@ -231,7 +231,7 @@ let get_decl_in_structure r struc =
 		  | _ -> error_not_visible r
     in go ll sel
   with Not_found ->
-    anomaly (Pp.str "reference not found in extracted structure")
+    anomaly (Pp.str "reference not found in extracted structure.")
 
 
 (*s Optimization of a [ml_structure]. *)