remove the gpg stuff from hgeditor (superseded by the signing extension) remove the gpg stuff from hgeditor, update the comments to make it clear it can be used to show a diff while commiting

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