debugindex: add --format flag to allow debugging parentdelta -f 1 shows extra data from revlogv1 (aka revlogng) including flags and size (based on a patch by Pradeepkumar Gayam <in3xes@gmail.com>)

pager: make example of setting pager less silly

convert: Work around p4 instability (issue2465) The p4 command-line client sometimes fails upon doing "p4 describe" when trying to produce a patch. (I'm guessing it's a bug in p4.) However, "hg convert" doesn't even make use of the patch, and it can be elided by adding "-s" to the p4 command line here.