Big tool rename.

As promised, this is the "big tool rename" patch.  The primary differences
since 0.99.6 are:

  (1) git-*-script are no more.  The commands installed do not
      have any such suffix so users do not have to remember if
      something is implemented as a shell script or not.

  (2) Many command names with 'cache' in them are renamed with
      'index' if that is what they mean.

There are backward compatibility symblic links so that you and
Porcelains can keep using the old names, but the backward
compatibility support  is expected to be removed in the near
future.

Signed-off-by: Junio C Hamano <junkio@cox.net>
diff --git a/t/t2000-checkout-cache-clash.sh b/t/t2000-checkout-cache-clash.sh
index a2c4260..03ea4de 100755
--- a/t/t2000-checkout-cache-clash.sh
+++ b/t/t2000-checkout-cache-clash.sh
@@ -3,7 +3,7 @@
 # Copyright (c) 2005 Junio C Hamano
 #
 
-test_description='git-checkout-cache test.
+test_description='git-checkout-index test.
 
 This test registers the following filesystem structure in the
 cache:
@@ -16,7 +16,7 @@
     path0/file0 - a file in a directory
     path1       - a file
 
-The git-checkout-cache command should fail when attempting to checkout
+The git-checkout-index command should fail when attempting to checkout
 path0, finding it is occupied by a directory, and path1/file1, finding
 path1 is occupied by a non-directory.  With "-f" flag, it should remove
 the conflicting paths and succeed.
@@ -28,8 +28,8 @@
 date >path1/file1
 
 test_expect_success \
-    'git-update-cache --add various paths.' \
-    'git-update-cache --add path0 path1/file1'
+    'git-update-index --add various paths.' \
+    'git-update-index --add path0 path1/file1'
 
 rm -fr path0 path1
 mkdir path0
@@ -37,15 +37,15 @@
 date >path1
 
 test_expect_failure \
-    'git-checkout-cache without -f should fail on conflicting work tree.' \
-    'git-checkout-cache -a'
+    'git-checkout-index without -f should fail on conflicting work tree.' \
+    'git-checkout-index -a'
 
 test_expect_success \
-    'git-checkout-cache with -f should succeed.' \
-    'git-checkout-cache -f -a'
+    'git-checkout-index with -f should succeed.' \
+    'git-checkout-index -f -a'
 
 test_expect_success \
-    'git-checkout-cache conflicting paths.' \
+    'git-checkout-index conflicting paths.' \
     'test -f path0 && test -d path1 && test -f path1/file1'
 
 test_done