PR/51497: Clare: Allow gpt -p <n> create to work.

branches: 1.22.2;
Rename 'a' to set the active PMBR flag to 'A'

PR/51230: Add the ability to set the active flag in the PMBR.

- add more informational messages
- handle case where last argument is an option not a device (set -l)

CID 1341556: Don't leak map info

WARNS=6

eliminate static globals so that commands can be re-used.

refactor more duplicated code.

Refactor the command dispatching and help printing logic.

Firs step of refactoring, remove all globals, factor out some common code,
handle alternate usage but not advertise it.

merge the create errors in one place and fix them.

provide a copy of the kernel uuid generator (with portable API calls) for
tools.

"0" is not guaranteed to be unique

Add internal uuid support, since the linux+macos versions of the library
are different than than *bsd ones, and others might not have it at all.

remove compat defines.

minor toolification: need libprop...

branches: 1.7.4;
Use MBR_PTYPE_ defines from <sys/bootblock.h>.

Clean up gpt(8) a bit more

uuid_create_nil(3) and uuid_is_nil(3) take a uuid_t*, not a pointer to
an array of bytes merely casted to compatible type.

Additonally, there no need for extra casts and address-of operations when
using le_uuid_*() functions.

Furthermore, le_uuid_*() are identical to uuid_*_le functions in
libc/libuuid, so use those instead on NetBSD.

branches: 1.5.2; 1.5.8;
Use __dead

Use less bogus CHS addresses in PMBR.
With the ending head set at 0xff one machine I have will never leave
the initial startup screen if such a disk is present. Additionally,
Wikipedia suggests without citiation that 254 is the maximium allowable
value for the head, and this seems to be the case.

Fix the usage strings for each command, and print them all for the
"global" usage. It's still a little ugly, but hopefully not as
fantastically confusing as before...

branches: 1.2.2; 1.2.4; 1.2.8; 1.2.10;
Make this work under NetBSD.

branches: 1.1.1;
Initial revision