Add revlog.strip to truncate away revisions. This updates the revlog data structures for index and nodemap in place so the .d and .i files don't need to be reread after stripping away a revision.

default = "changelog"
header = header-rss.tmpl
changelog = changelog-rss.tmpl
changelogentry = changelogentry-rss.tmpl
filelog = filelog-rss.tmpl
filelogentry = filelogentry-rss.tmpl