merge with crew

test-audit-path: add one more test (issue 1450)

convert/gnuarch: follow continuation-of revisions Built on top of previous patches: - continuation-of parsing - registered archives retrieval - use of fully qualified revisions This allows the converter scanning for more source revisions following the tree versions 'leaked' through the continuation-of informations. Coupled with the registered archives retrieval, this makes possible to decide to follow such a hint or stop scanning for more revisions. This also implies some changes in the retrieval of some base-0 revisions when they're continuation-of other revisions, in that case a 'replay' will work where a simple 'get' fails because the dir exists already. I found the code dealing with 'replay' quite good as it has already a fallback to 'get' in the error path.

convert/gnuarch: retrieve known archive names list This will make possible in a followup patch to prevent following history that is not reachable because an archive is unknown to the user.

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.

convert/gnuarch: use fully qualified revisions There is no need loosing information in the conversion process. This could lead to wrong shamap mappings if different archives used the same 'version' naming.

convert/gnuarch: keep track of original revision in extra headers It seems to be standard to populate the .rev attribute of a commit to keep track of original SCM revision names. Just do it(tm).

convert/gnuarch: robustify cat-log retrieval GNU Arch used to scale very poorly when revision number was increasing. This was mostly caused by the huge amount of cat-log it has to scan/read through to keep track of all patches that were merged in a given revision. In order to improve things, cat-log prunning was a common admin task that would accelerate cat-log parsing at the expense of unreachabe locally stored cat-logs. However, these missing cat-logs are still available in the archive. So try to get them from the archive as a fallback solution.

convert/gnuarch: set prefered locale for str conversions Seems necessary, as a test on my archives goes further with this.

convert/gnuarch: fix cat-log parsing cat-log parsing was very wrong. It assumed the Summary header was comming last, which is wrong. Plus the code was buggy because it was concatenating all headers in the summary. As parsing GNU Arch isn't trivial, and python email code does it so well... just use that ;-)