Don't allow --style and --template for hg update and hg merge.
The only way that changesets will be shown with these command is in an error
message when trying to update to an ambiguous branch name.
port:4:export
port:4:vaportight
port:4:import/export
FIXME: history is wrong here
port:1:1:-:eggs:import
port:1:2:+:eggs:vaportight
port:1:3:+:eggs:import/export
port:0:2:+:spam:export
port:0:1:+:spam:import
port:4:import/export