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.
1:f248da0d4c3e
0:9eca13a34789
f248da0d4c3e tip
9eca13a34789
9eca13a34789+
reverting file1
9eca13a34789
f248da0d4c3e tip
merge: warning: conflicts during merge
merging file1
merging file1 failed!
diff -r f248da0d4c3e file1
--- a/file1
+++ b/file1
@@ -1,3 +1,7 @@ added file1
added file1
another line of text
+<<<<<<<
+changed file1 different
+=======
changed file1
+>>>>>>>
M file1
f248da0d4c3e+ tip
reverting file1
f248da0d4c3e tip
f248da0d4c3e tip
f248da0d4c3e tip