fileset: add a 'status(...)' predicate to control evaluation context Same as 'revs', this predicate does not select files but switches the evaluation context. This allow to match file according arbitrary status call. We can now express the same query as 'hg status'. The API (two 'revsingle' class) have been picked instead of a single 'revs' revset for multiple reasons: * it is less confusing to express * it allow to express more query (eg: backward status, cross branch status)

fileset: allow to specify a basectx for status This will be used for a predicates that defines the status range of a match.

fileset: add revs(revs, fileset) to evaluate set in working directory Unlike other functions, "revs()" does not select files but switches the evaluation context. This allow to match file with property in another revision that the one currently evaluated. This changeset is based on work from Yuya Nishihara.

fileset: add function to switch revision where fileset will be evaluated If the subset isn't filtered yet, i.e. if fullmatchctx, the new subset is recalculated from scratch. Otherwise, it is narrowed by the existing subset.