Revise *status help output

Make it possible to output help for given command(s) and align
casing & arguments in general help & command specific usage output.
Revise *controlpanel help output

Make the output easier to read by wrapping mandatory argument names
with angle brackets (just like in *status help), and make it possible
to output help for given command(s). Furthermore, output only relevant
variable lists and align casing & arguments in general help & command
specific usage output.
Merge pull request #629 from jpnurmi/help

Revise *status and *controlpanel help output
Utils: don't capitalize password
Utils: fix indentation of bold messages
Utils: improve password prompt

Check if the password is empty before asking to confirm it.
makeconf: kill buffer and chan mode questions

Use webadmin/controlpanel to configure buffers and default chan modes
makeconf: use username instead of nick as ident

Username and ident are more likely to match.
makeconf: offer SSL by default if the port is 6697
makeconf: just warn if the config exists

Don’t require typing yes to continue, it’s inconvenient.
makeconf: improve alternate location handling
makeconf: promote webadmin