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 b
+ hg commit -m commit #0 -d 0 0
+ hg commit -mcomment #1 -d 0 0
+ hg update 0
+ hg commit -A -mcomment #2 -d 0 0
removing b
+ hg update 1
this update spans a branch affecting the following files:
b
aborting update spanning branches!
(use update -m to merge across branches or -C to lose changes)