[PATCH 1 of 4] profiling: Adding a profiling.format config variable

[timeless]

> +            ui.warning(_("Unknown profiling format '%s'"

Replace "Unknown" with "Unsupported" or "Unrecognized"

> +                        ui.warn(_('exception raised - generating '

"raised" is odd, is one of  "thrown" or "encountered' ok?
if not, please explain

> +                                 'profile anyway\n'))

> +                    'lsprof not available - install from '

is not