RFC: make gpart(8) sector size aware

[Andrey V. Elsukov]

Hi, All.

I made a patch that makes gpart(8) sector size aware.
There is a known issue described in bin/146277.

gpart(8) uses type ASCLBA for size-related params and it doesn't know
about provider's sector size when geom(8) parses arguments. By default
it assumes that sector size is 512 bytes. And when user specifies size or
start offset params in humanized form they being calculated into sectors
incorrectly.

It seems that only gpart(8) uses G_TYPE_ASCLBA and there are none of another
consumers, so I deleted this type and replace it to G_TYPE_STRING. And now
gpart(8) converts size-related params after geom(8) when it can know provider's
sector size.

My patch is here:
http://people.freebsd.org/~ae/gpart_sectorsize.diff

Also I replaced `unsigned long long` type for `off_t` for unify code since
it seems off_t used for media size in libgeom(8) and for DIOCGMEDIASIZE ioctl.

-- 
WBR, Andrey V. Elsukov

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