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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% no diff if hardlink

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% init

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adding foo to series file

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applying foo

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Now at: foo

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adding bar to series file

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applying bar

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Now at: bar

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430ed4828a74fa4047bc816a25500f7472ab4bfe:foo

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4e7abb4840c46a910f6d7b4d3c3fc7e5209e684c:bar

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%

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foo

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bar

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%%%

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430ed4828a74fa4047bc816a25500f7472ab4bfe:foo

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%

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foo

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%%%

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4e7abb4840c46a910f6d7b4d3c3fc7e5209e684c foo

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430ed4828a74fa4047bc816a25500f7472ab4bfe bar

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%

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4e7abb4840c46a910f6d7b4d3c3fc7e5209e684c lfoo

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430ed4828a74fa4047bc816a25500f7472ab4bfe lbar

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%%%

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4e7abb4840c46a910f6d7b4d3c3fc7e5209e684c foo

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%

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4e7abb4840c46a910f6d7b4d3c3fc7e5209e684c lfoo