Further help improvements:
Show command aliases in 'hg help something', unless in quiet mode.
Show short command description with 'hg help -q something'.
Show global options in verbose mode of command help.
State that Mercurial is a Distributed SCM.
+ hg init
+ hg add a
+ hg commit -m first -d 0 0 a
+ hg add sub/b
+ hg commit -m second -d 0 0 sub/b
321
+ hg co 0
cat: sub/b: No such file or directory
ls: sub: No such file or directory