1.
If "p5 share" sees files in the default changeset, it should print
something that looks like a changeset description summary for those
files. (It's too easy to have files in the default changeset
unintentionally, so it makes sense to have p5 desc/p5 share scream
about them.)
2. Add support for "-s" flag to "p5 share" and "p5 desc".
(If the user says "p5 desc -s", they probably mean something
like "p5 describe -s <all-changesets-including-default>".
Thanks to (1), above, that now makes sense.)