cvs2git: fix character quoting

We need to quote backslash and backtick too.

And inform the user about our progress, since converting a
big archive can take time. Doing the full mutt history took
just under eight minutes.

cvs2git.c

@@ -114,6 +114,8 @@ static void commit(void)
 
 		switch (c) {
 		case '$':
+		case '\\':
+		case '`':
 			putchar('\\');
 			break;
 		case 0 ... 31:
@@ -133,6 +135,8 @@ static void commit(void)
 
 	printf("echo $commit > .git/refs/heads/'%s'\n", dst_branch);
 
+	printf("echo 'Committed (to %s):' ; cat .cmitmsg; echo\n", dst_branch);
+
 	*date = 0;
 	*author = 0;
 	*branch = 0;