Convert "skin" to "tool" in various places;  almost entirely within comments,
nothing that will affect code.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@2217 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/coregrind/vg_replace_malloc.c b/coregrind/vg_replace_malloc.c
index 9c310dd..ce02c97 100644
--- a/coregrind/vg_replace_malloc.c
+++ b/coregrind/vg_replace_malloc.c
@@ -36,7 +36,7 @@
    have no prototypes in vg_include.h, since they are not intended to
    be called from within Valgrind.
 
-   This file can be #included into a skin that wishes to know about
+   This file can be #included into a tool that wishes to know about
    calls to malloc().  It should define functions SK_(malloc) et al
    that will be called.
    ------------------------------------------------------------------ */