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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hg init test

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cd test

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echo foo > a

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hg ci -Ama

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hg up -r0000

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echo bar > a

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echo % should issue warning

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hg ci -Amb

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hg up -r0000

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echo stuffy > a

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echo % should not issue warning

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hg ci -q -Amc

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hg up -r0000

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echo crap > a

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hg branch testing

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echo % should not issue warning

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hg ci -q -Amd