Add separate fa_sha1 field to filearchive table

Add separate fa_sha1 field to filearchive table

This allows sha1 searches with the api in miser mode for deleted files

Added script to populate the rows
Adding new field to selects and handle it in all places, where needed

Using a 10 byte index for the new field per
http://lists.wikimedia.org/pipermail/wikitech-l/2012-September/063429.html

Change-Id: Ie54a513fe361202e63df44be44a0fdd91926c974