mt(1)/libmt: Add LTO-10 density codes and specs.stable/14

These were obtained from IBM specs and actual tapes/drives.

Standard LTO-10 cartriges hold 30TB raw, 75TB with 2.5:1 compression.
Premium LTO-10 cartridges hold 40TB raw, 100TB with 2.5:1 compression.
LTO-10 tape drives are not backward compatible with previous generation
LTO tapes. (This is a change from older generation drives.)

Since the Premium tape is a new thing for LTO, we'll call this density
code LTO-10P vs. the standard LTO-10.  The barcode identifier for LTO-10
tapes is "LA"; the barcode identifier for LTO-10P tapes is "PA".

LTO-10 cartridges contain 1035m of tape, while LTO-10 Premium
cartridges contain 1337m of tape and have slightly higher density.
(Obtained from MAM data on actual tape cartridges and the density
report, obtained via 'mt getdensity'.)  LTO-10 cartridges use a
polyethylene naphthalate (PEN) film substrate. LTO-10 Premium
cartridges use an Aramid (aromatic polyamide) substrate that is thinner
and stronger, allowing a longer tape to fit in the same cartridge form
factor.

usr.bin/mt/mt.1:
	Add density codes and specs for LTO-10 and LTO-10P.

lib/libmt/mtlib.c:
	Add density codes for LTO-10 and LTO-10P.

Sponsored by:	Spectra Logic

(cherry picked from commit 930486f9be5c884d1d2f0aae9f81a3f5af1f2718)

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