Do not suppress old revisions from _changes
Do not suppress old revisions from _changes

Requests to '_changes?style=all_docs' with a 'since' parameter would
suppress revisions of a document generated before the start of the
feed.  The assumption may have been that those revisions were seen by
the client in a previous request to _changes, but this is not
necessarily true if the client is resuming the feed after a partial
download.

The safe thing to do is to include all leaf revisions for each document
in the feed.

Thanks Bob Dionne for the test code.

Closes COUCHDB-1256

git-svn-id: c1f8a8ec0b3bb2e99ab3413722f81f687760e79c@1161697 13f79535-47bb-0310-9956-ffa450edef68

apache/couchdb-couch,alanning/couchdb-couch,ngpestelos/couchdb-couch,fkaempfer/couchdb,cloudant/couchdb-couch,KlausTrainer/couchdb-couch,smithsz/couchdb-couch,fkaempfer/couchdb,alanning/couchdb-couch,fkaempfer/couchdb,ngpestelos/couchdb-couch,smithsz/couchdb-couch,cloudant/couchdb-couch,KlausTrainer/couchdb-couch,fkaempfer/couchdb,cloudant/couchdb-couch,ngpestelos/couchdb-couch,apache/couchdb-couch,smithsz/couchdb-couch,KlausTrainer/couchdb-couch,alanning/couchdb-couch,fkaempfer/couchdb,apache/couchdb-couch,fkaempfer/couchdb