Add cg-tag-ls command

cg-tag-ls lists all tags in a GIT repository.

Index: Makefile
===================================================================
--- c3aa1e6b53cc59d5fbe261f3f859584904ae3a63/Makefile (mode:100644 sha1:d73bea1cbb9451a89b03d6066bf2ed7fec32fd31)
+++ uncommitted/Makefile (mode:100644)
@@ -44,7 +44,7 @@

        cg-add cg-admin-lsobj cg-cancel cg-clone cg-commit cg-diff \
        cg-export cg-help cg-init cg-log cg-ls cg-merge cg-mkpatch \
        cg-patch cg-pull cg-branch-add cg-branch-ls cg-rm cg-seek cg-status \

- cg-tag cg-update cg-Xlib
+ cg-tag cg-tag-ls cg-update cg-Xlib

COMMON= read-cache.o

Index: cg-help
===================================================================
--- c3aa1e6b53cc59d5fbe261f3f859584904ae3a63/cg-help (mode:100755 sha1:d16446c005c4698f408bf651afd718d95f5a9cfe)
+++ uncommitted/cg-help (mode:100755 sha1:31ea484f757fc4bf5de25acb621e219f4bfb0f52)
@@ -42,6 +42,7 @@
cg-seek [COMMIT_ID]
cg-status
cg-tag TNAME [COMMIT_ID]
+ cg-tag-ls
cg-update [BNAME]
cg-version

Index: cg-tag-ls
===================================================================

sha1:15b5db0cd2a023a078f467d1bcd3bc0c5eb833dc)
@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+#
+# List stored GIT tags.
+# Copyright (c) Steve Hoelzer 2005
+#
+# Takes no parameters.
+
+. cg-Xlib
+
+mkdir -p .git/refs/tags
+[ "$(find .git/refs/tags -follow -type f)" ] \
+ || die "List of tags is empty. See cg-tag."
+
+cd .git/refs/tags
+for tag in *; do

+       echo -n $tag
+       echo -ne "\t"
+       cat $tag

+done