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, 4 insertions, 4 deletions

diff --git a/library/impargs.ml b/library/impargs.ml
index 885185da1..8f3bfc17e 100644
--- a/library/impargs.ml
+++ b/library/impargs.ml
@@ -291,16 +291,16 @@ let is_status_implicit = function
   | _ -> true
 
 let name_of_implicit = function
-  | None -> anomaly (Pp.str "Not an implicit argument")
+  | None -> anomaly (Pp.str "Not an implicit argument.")
   | Some (id,_,_) -> id
 
 let maximal_insertion_of = function
   | Some (_,_,(b,_)) -> b
-  | None -> anomaly (Pp.str "Not an implicit argument")
+  | None -> anomaly (Pp.str "Not an implicit argument.")
 
 let force_inference_of = function
   | Some (_, _, (_, b)) -> b
-  | None -> anomaly (Pp.str "Not an implicit argument")
+  | None -> anomaly (Pp.str "Not an implicit argument.")
 
 (* [in_ctx] means we know the expected type, [n] is the index of the argument *)
 let is_inferable_implicit in_ctx n = function
@@ -324,7 +324,7 @@ let positions_of_implicits (_,impls) =
 
 let rec prepare_implicits f = function
   | [] -> []
-  | (Anonymous, Some _)::_ -> anomaly (Pp.str "Unnamed implicit")
+  | (Anonymous, Some _)::_ -> anomaly (Pp.str "Unnamed implicit.")
   | (Name id, Some imp)::imps ->
       let imps' = prepare_implicits f imps in
       Some (id,imp,(set_maximality imps' f.maximal,true)) :: imps'