NEW VERSION: from heritrix, includes many fixes to ARCReader to handle older (corrupted in some senses) ARC files.
NEW VERSION: from heritrix, includes many fixes to ARCReader to handle older (corrupted in some senses) ARC files.

git-svn-id: 25dac4f723c7e5b42083d4a98669c37f60455592@1614 69e27eb3-6e27-0410-b9c6-fffd7e226fab

ato/wayback,ato/wayback