help: show extension commands in short list, separate extension list in help
In 'hg', we now show a short list of commands, including extension commands.
In 'hg help', we show core commands, a list of enabled extensions, and topics.
#!/bin/sh
hg init a
cd a
mkdir a
echo a > a/b
hg ci -Am m
hg rm a
hg ci -m m a
mkdir a b
echo a > a/b
hg ci -Am m
hg rm a
cd b
# relative delete
hg ci -m m ../a