- Copy stable/10 (r259064) to releng/10.0 as part of the
10.0-RELEASE cycle.
- Update __FreeBSD_version [1]
- Set branch name to -RC1

[1] 10.0-CURRENT __FreeBSD_version value ended at '55', so
start releng/10.0 at '100' so the branch is started with
a value ending in zero.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Update the firmware image used for the SIJET cards to the latest available
in the SDK from Specialix/Perle. The prior version was
JET.BIN Version 3.0.6 Beta I and the new version is JET__.BIN Version 4.0.1.

MFC after: 1 week

Start each of the license/copyright comments with /*-, minor shuffle of lines

Use __FBSDID().
Also some minor style cleanups.

Always leave SP_DCEN on (monitor DCD). Otherwise the firmware *really*
does ignore DCD. Even TIOCMGET cannot read DCD as the firmware doesn't
report it. This has pretty interesting effects for ppp(8) which runs
in clocal mode and polls carrier (!). (Specialix's linux driver does
this too)

Also update the firmware to 3.0.6 for the SX cards, as apparently there
was a problem with floating (disconnected) DCD pins causing stray carrier
transitions, especially at port open time.

It seems to work here, and carrier loss is detected nearly immediately
rather than having to wait for a LQR timeout (a few minutes) before ppp(8)
gives up.

DCD problem noted by: nsayer

A bit more newbusification of si. This still isn't quite finished.
Split out the bus attachments so the impact of the bus xxxvar.h files
with the inline macros for the ivars are confined to one file each.

Fix some -Wunused warnings

Staticize.

Update Specialix download microcode for the transputer based serial host
cards from the 3.0-beta to 3.0.4 release.

Submitted-by: Nick Sayer <nsayer@quack.kfu.com>
PR: 10674

New versions of Specialix host card download code.

Submitted by: Nick Sayer <nick@quack.kfu.com>