Started to rescind the name "skin", replacing it with "tool".  Did this in all
the places that normal users will see:

  - command line: --tool=foo (although --skin=foo still works)
  - docs: removed all traces (included renaming coregrind_skins.html to
    coregrind_tools.html)
  - in the usage messages
  - in error messages

Also did in in some places that I judged were unlikely to cause clashes with
existing workspaces:

  - in the header comments of many files (eg. "This file is part of Memcheck, a
    Valgrind tool for...")
  - in the regtests script
  - in the .supp files
  - in AUTHORS
  - in README_MISSING_SYSCALL_OR_IOCTL

Also update the AUTHORS file to mention Jeremy.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@2027 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/docs/manual.html b/docs/manual.html
index 63e5820..b69a9cf 100644
--- a/docs/manual.html
+++ b/docs/manual.html
@@ -102,11 +102,11 @@
 
 <p>
 The following is not part of the user manual.  It describes how you can
-write skins for Valgrind, in order to make new program supervision
+write tools for Valgrind, in order to make new program supervision
 tools.
 
-<h4>7&nbsp; <a href="coregrind_skins.html">
-            Valgrind Skins</a></h4>
+<h4>7&nbsp; <a href="coregrind_tools.html">
+            Valgrind Tools</a></h4>
 
 <p>
 The following are not part of the user manual.  They describe internal