clfilter: introduce `filteredrevs` attribute on changelog
This changeset allows changelog object to be "filtered". You can assign a set of revision numbers to the `changelog.filteredrevs` attributes. The changelog will then pretends these revision does not exists in this repo. A few methods need to be altered to achieve this behavior: - tip - __iter_ - irevs - hasnode - headrevs For consistency and to help debugging, the following methods are altered too. Tests tend to show it's not necessary to alter them but have them raise proper exception helps to detect bad acces to filtered revisions. - rev - node - linkrev - parentrevs - flags The following methods would also need alteration for consistency purpose but this is non-trivial and not done yet. - nodemap - strip The C version of headrevs is not run if there is any revision to filter. It'll need a proper rewrite later to restore performance.
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