Rather than externalizing the package index plist file to storage every
time a package is registered, only do it one time once all packages
have been processed. Creating an index with 700 pkgs now takes 14s
in a VM, where before it took 39s. As consequence of this, the 'add-pkgidx'
target is no longer relevant or useful, remove it.
--HG--
extra : convert_revision : xtraeme%40gmail.com-20091118053439-ct1chn4hdeir1pdo
