[coq] Untabify the whole ML codebase.

We also remove trailing whitespace.

Script used:

```bash
for i in `find . -name '*.ml' -or -name '*.mli' -or -name '*.mlg'`; do expand -i "$i" | sponge "$i"; sed -e's/[[:space:]]*$//' -i.bak "$i"; done
```

1 files changed, 1 insertions, 1 deletions

diff --git a/dev/vm_printers.ml b/dev/vm_printers.ml
index 11565b99eb..73cf1b0195 100644
--- a/dev/vm_printers.ml
+++ b/dev/vm_printers.ml
@@ -51,7 +51,7 @@ let rec ppzipper z =
       let n = nargs args in
       open_hbox ();
       for i = 0 to n-2 do
-	ppvalues (arg args i);print_string ";";print_space()
+        ppvalues (arg args i);print_string ";";print_space()
       done;
       if n-1 >= 0 then ppvalues (arg args (n-1));
       close_box()