nim --helpfull (combines --help and --advanced for easier grepping of cmds)

[timotheecour]

--advanced seems a bit less useful than a combined thing, eg --helpfull as often users don't know whether cmd is in --help or --advanced and have to grep for both.
if noone wants to implement, would PR's be accepted?

[data-man]

I propose combine --help and --advanced into --help and remove --advanced switch.

[timotheecour]

or, --help and --advanced with --advanced containing --help.
don't care which option is used so long there's an option that contains all the help