cmdline: for new tools avoid introduce new negative switches, and properly align...

cmdline: for new tools avoid introduce new negative switches, and properly align --help texts

Negative switches are a bad un-normalized thing. We alerady have some,
but we should try harder to avoid intrdoucing new ones.

Hence, instead of adding two switches:

        --foobar
        --no-foobar

Let's instead use the syntax

        --foobar
        --foobar=yes
        --foobar=no

Where the first two are equivalent. The boolean argument is parsed
following the usual rules.

Change all new negative switches this way.

This patch also properly aligns the --help table, so that single char
switches always get a column separate of the long switches.