This version is 12x faster than current implementation in shell script.
To generate an index for 434 packages, current implementation took
5min and 56 seconds. New implementation only took 29 seconds!
New implementation also doesn't add duplicate packages, and updates
the package entry for new package versions.
--HG--
extra : convert_revision : 269d38ee18184b585877fd729bf95e07ce57dd50
