convert/gnuarch: parse continuation-of revisions in gnuarch source In GNU Arch, continuation-of was often used for: - tagging revisions - continue working on a project in a new archive, because arch was scaling poorly in revision numbers (cat-logs were slow to be parsed and scanned through) - very similar to the previous point, fork his own branch of a project. Parsing this header information will allow to 'follow' new history because it often hints at older/forked/personal revision trees. This patch however just implements the parsing of the continuation-of header. A followup patch will implement the proper use of this new information.

changeset:   0:61c9426e69fe
tag:         tip
user:        test
date:        Thu Jan 01 00:00:00 1970 +0000
summary:     test

---- HEADERS
200 Script output follows
---- DATA
[('Content-Type', 'text/html; charset=ascii')]
---- ERRORS