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.

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changeset:   0:9c2cf2b35aa7

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user:        test

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date:        Mon Jan 12 13:46:40 1970 +0000

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summary:     add foo

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changeset:   1:3756a9556b89

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tag:         tip

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user:        test

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date:        Mon Jan 12 13:46:41 1970 +0000

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summary:     change foo

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9c2cf2b35aa7

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3756a9556b89