Implement a number of primaries present in GNU find, but not present

in our find.

The following are nops because they aren't relevant to our find:
	-ignore_readdir_race
	-noignore_readdir_race
	-noleaf
The following aliaes were created:
	-gid -> -group		[2]
	-uid -> -user		[2]
	-wholename -> -path
	-iwholename -> ipath
	-mount -> -xdev
	-d -> -depth		[1]
The following new primaries were created:
	-lname	like -name, but matches symbolic links only)
	-ilname like -lname but case insensitive
	-quit	exit(0)
	-samefile returns true for hard links to the specified file
	-true	Always true
I changed one primary to match GNU find since I think our use of it violates
POLA
	-false	Always false (was an alias for -not!)

Also, document the '+' modifier for -execdir, as well as all of the above.
This was previously implemented.

Document the remaining 7 primaries that are in GNU find, but aren't yet
implemented in find(1)

[1] This was done in GNU find for compatibility with FreeBSD, yet they
mixed up command line args and primary args.

[2] -uid/-gid in GNU find ONLY takes a numeric arg, but that arg does the
normal range thing that.  GNU find -user and -uid also take a numberic arg,
but don't do the range processing.  find(1) does both for -user and -group,
so making -uid and -gid aliases is compatible for all non-error cases used
in GNU find.  While not perfect emulation, this seems a reasonable thing
for us.

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